# i need the exat percentage of nitrogen in magnesium nitride

6,975 results, page 58
1. ## math

compare the annual percentage yield for three banks. Bank 1 offers an APR of 3.8% compounded daily; bank 2 offers an APR of 4.1% compounded monthly; bank 3 offers an APR of 4.5% compounded quarterly

asked by geri on November 17, 2010
2. ## math

The table shows the average production data for three products over the last month. The difference between the costs and the sale price is the company profit for one unit. If a new production method allows the labor costs of Product C to be reduced to

asked by vin on May 18, 2016
3. ## Chemistry

I just completed a titration lab and the balanced equation is (8H^+)+MnO4^- + 5Fe (^2+) ---> Mn + 4 H20 + 5 Fe(^3+) I'm supposed to calculate the moles of permanganate, Fe^2+ and the mass of iron from the sample. The volume of permanganate is 33.5, and the

asked by Sven on September 3, 2007
4. ## math

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 64

asked by Anonymous on December 1, 2015
5. ## math

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 63

asked by nina on April 27, 2018
6. ## aiu

Analysis techniques include the following: • Comparative financial statements • Trend analysis • Ratio analysis • Percentage analysis Presentation of 5–10 PowerPoint slides that includes the following: • At least 3 slides relevant to the

asked by mary on September 7, 2013
7. ## Calculus

1. In a certain country, the percentage of the population relocating to a new town is given by the following function: p(t) = 20.6e^-0,009t,where 0 _< t _< 52. Time is zero (t = 0) corresponds to the year 1960. 1. Find the rate at which people relocated

asked by Deeno on April 9, 2013
8. ## Maths

There are fifty students in a class. In a 100 marks exam, 20 students scored less than 30 marks, 5 students scored more than 70 marks and the remaining scored between 30 and 70 marks. If passing score is 55 marks and 40% students have passed the test, what

asked by Muhammad on July 13, 2017
9. ## Math

In a class of 83 students, 72 are present. What percentage of the students are absent? Provide answer up to two significant digits. a. 12 b. 13 c. 14 d. 15 What I did is I subtracted both 83 and 72 which is 11 and I put it as proportions. I put x as a

asked by Bella on October 7, 2017
10. ## math

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 56

asked by john on December 1, 2015
11. ## science

An intermediate reaction used in the production of nitrogen containing fertilizers is that b/w NH3 and O2 4NH3(g) + 5O2(g)--> 4NO(g) + 6H2O(g) A 150.0-L reaction chamber is charged with reactants to the following partial pressures at 500 degrees C: P(sub

asked by Chris on January 4, 2007
12. ## Chemistry

DECOMPOSITION OF NO2 (10/10 points) The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in mol/liter, while time is expressed in seconds. [NO2] ln[NO2] 1/[NO2] Time

asked by 3.091 on July 30, 2014
13. ## Biology

1. A theory and a hypothesis are different in that: A. you must have a theory before you can form a hypothesis. B. a theory is developed as a result of broad agreement among scientists and a hypothesis is a much less substantiated idea. C. a theory is much

asked by Amy on July 10, 2013
14. ## Calculus I, differentiation

The number, N, of people who have heard a rumor spread by mass media by time, t, is given by N(t)=a(1−e−kt). There are 6 million people in the population, who hear the rumor eventually. If 5% of them heard it on the first day, find the percentage of

asked by Brian on February 25, 2013
15. ## Chemistry

To a mixture of NaCl and Na2CO3 with a mass of 1.300 g was added 55.00 mL of 0.243 M HCl (an excess of HCl). The mixture was warmed to expel all of the CO2 and then the unreacted HCl was titrated with 0.100 M NaOH. The titration required 7.40 mL of the

asked by Gabe on December 2, 2014
16. ## Finance

Answers for a 10 year us treasury bond has a 3.50 % interest rate, while a same maturity corporate bond has a 5.25 % interest rate. Real interest rates and inflation rate expectations would be for the two bonds. if default risk premium of 1.50 percentage

asked by Ann on May 3, 2012
17. ## statistics

I.use the chebyshev's theorem to find out what percentage of the values will fall between 201 and 257 for a data set with a mean of 229 and standard deviation of 14. II. use the emperical rule to find out two values 68% of the data will fall between for a

asked by mary on October 12, 2010
18. ## Math

A random sample was taken from Wyoming. Eighty percent of students reported that they like dogs, 64% reported they like cats, and 97% reported that they like dogs or cats. What percentage of students like both dogs and cats?

asked by Tonya on July 27, 2013
19. ## Chemistry

a)How much would the freezing point change in a 2.5m solution of phenol in benzene? (freezing point of phenol is 7.40 degrees C, freezing point of benzene is 5.12 degrees C) b)How much would the boiling point change in a 1.0m solution of magnesium chloride

asked by Danny on May 4, 2010
20. ## science

Try MgBr2 and I expect you can balance it. i got a balancing equation problem i gotta get this to balance Mg(OH)2+ HBr --> MgBr + H20 so far i'v gotten it down to 2Mg(OH)2+ 4HBr --> 2MgBr + 4H20 but it's still not balanced,so can someone please balance

asked by DrBob222 on December 13, 2006
21. ## SS Help, FAST!!!!!

What does this graph suggest about the costs and benefits of balancing the budget? (Graph: Only with spending cuts: 20% Mostly with spending cuts: 30% Equally with spending cuts and higher taxes: 32% Mostly with higher taxes: 7% Only with higher taxes: 3%)

asked by Agala on February 23, 2017
22. ## math

The smith family is going on a five day journey. On tuesday the cover 7 over 24 of the total distance, on Wednesday 11 over 48 on Thursday 3 over 16 and on Friday 1 over 8. a). What percentage of the journey do they cover on Thursday? b). What fraction of

asked by Anonymous on February 16, 2014
23. ## Math

The population in a 55 square mile city, City A, is 44,000. A neighboring city, City B, measures 65 square miles and has 48,750 citizens. Determine which city has a greater population density and by what percentage its population density is greater than

asked by Kimber on March 4, 2017
24. ## budgeting

You are estimating the contractor’s material handling cost as a factor of the material cost. After examining 6 previous contracts you have the percentage (factor) for each contract: 2.5% 6.2% 3.2% 12.9% 7.0% 15.3% All of the following would be reasonable

asked by ron on February 8, 2012
25. ## chemistry asap!

I'm having trouble solving this percentage concentration problem: A student wants to make 5.00% solution of rubidium chloride using 0.377g of the substance. What mass of water will be needed to make the solution? [g RbCl2/(g RbCl2 + g H2O)]x100 = 5.00

asked by michelle on January 25, 2007
26. ## Math

I need help with this problem. Jason's credit cards beginning unpaid balance for August is \$2,000. During the August billing cycle he made a payment of \$200 and used card to purchase \$50 worth of groceries. Credit card charges 24% annual percentage rate

asked by Princess on January 17, 2011
27. ## help

The interest rate on a second mortgage was5 7/8 % last month. This month the interest rate is 7 3/2 %. How many percentage points has the interest rate increased? Are you sure you mean 7 3/2% ? No lender would write an intereest rate that way. Perhaps you

asked by carmen on March 26, 2007
28. ## Statistics

M&M plain candies come in various colors. According to the M&M/Mars Department of Consumer Affairs, the distribution of colors for plain M&M candies is as follows. Color Purple Yellow Red Orange Green Blue Brown Percentage 18% 19% 21% 9% 9% 6% 18% Suppose

asked by Anonymous on July 9, 2011
29. ## Statistics

Types of bonds are divided into three categories: good risk, medium risk, and poor risk. Assume that of a total of 13,838 bonds, 7,035 are good risk, 1,388 are medium risk, and the rest are poor risk. One bond is chosen risk? Write only a number as your

asked by Obi on October 2, 2015
30. ## chem

A 0.70 g mixture of Cu and CuO was treated with hydrogen at elevated temperature. CuO was reduced to Cu and water was formed. (a) Write a balanced equation for the reaction. (2 marks) (b) Before the experiment, calculate the minimum amount (in mole) of

asked by lightningtx on October 13, 2016
31. ## statistics

11. (4 pts) The following statistics provide information about the scores on a national mathematics exam. Mean 312 First Quartile 201 Median 296 Third Quartile 423 Mode 326 49th Percentile 307 a) What score did half of the test takers surpass? b) What was

asked by Rose on December 15, 2007
32. ## statistics

11. (4 pts) The following statistics provide information about the scores on a national mathematics exam. Mean 312 First Quartile 201 Median 296 Third Quartile 423 Mode 326 49th Percentile 307 a) What score did half of the test takers surpass? b) What was

asked by Rose on December 15, 2007
33. ## Maths

I got 30% on a 10-problem test, 70% on a 20-problem test and 80% on a 30-problem test. If the three tests are combined in one 60-problem test what percentage is my overall score?

asked by Amy on November 17, 2016
34. ## Math

A grapefruit is 8% heavier than an orange, and an apple is 10% lighter than the orange. By what percentage is the apple lighter than the grapefruit?

asked by Anonymous on June 8, 2016
35. ## Maths Percentage

Find the percentage of pure gold in 22-carat gold, if 24-carat gold is 100% pure gold.

asked by Vivek on September 24, 2016
36. ## Math

A grapefruit is 8% heavier than an orange, and an apple is 10% lighter than the orange. By what percentage is the grapefruit heavier than the apple?

asked by Anonymous on June 8, 2016
37. ## math

The ratio of boys and girls in a class is 5:3 if 20 % of the boys and 60 % of girls have passed in first class what percentage of the class is in first class?

asked by Rohit on February 17, 2016
38. ## Applied Stats

Based on the data collected by the National Centre for health Statistics and made available to the public in the Sample Adult database, it was found that the percentage of adults who have at some point in their life been told that they have hypertension

asked by Anonymous on August 8, 2016
39. ## MATH NEED HELP ASAP!!!!!

The table below shows the percentage of households that own a microwave in different countries. Construct a stem-and-leaf plot of the data. Country Percent Of Household With Microwave Ovens _____________________________________________________________

asked by Girl with questions. on February 10, 2016
40. ## Some Body Plz help math Nca

The table below shows the percentage of households that own a microwave in different countries. Construct a stem-and-leaf plot of the data. Country Percent Of Household With Microwave Ovens _____________________________________________________________

asked by Side Walks on March 14, 2017
41. ## Math: Personal Finance

In order to buy a new car, you finance \$20,000 with no down payment for a term of five years at an APR (Annual Percentage Rate) of 6%. After you have the car for one year, you are in an accident. No one is injured, but the car is totaled. The insurance

asked by Kinsey on June 22, 2016
42. ## algebra

The table below shows the percentage of households that own a microwave in different countries. Construct a stem-and-leaf plot of the data. Country Percent Of Household With Microwave Ovens _____________________________________________________________

asked by Erica McDonnell on February 22, 2018
43. ## pre algebra

The table below shows the percentage of households that own a microwave in different countries. Construct a stem-and-leaf plot of the data. Country Percent Of Household With Microwave Ovens _____________________________________________________________

asked by Erica McDonnell on February 22, 2018
44. ## chemistry

The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 6.35-g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the

asked by Anonymous on February 24, 2012
45. ## Math!

The table below shows the percentage of households that own a microwave in different countries. Construct a stem-and-leaf plot of the data. Country Percent Of Household With Microwave Ovens _____________________________________________________________

asked by Christa on March 5, 2014
46. ## Pre- Algebra

The table below shows the percentage of households that own a microwave in different countries. Construct a stem-and-leaf plot of the data. Country Percent Of Household With Microwave Ovens _____________________________________________________________

asked by #FreeGucci on February 17, 2016
47. ## Statistics

Types of bonds are divided into three categories: good risk, medium risk, and poor risk. Assume that of a total of 13,838 bonds, 7,035 are good risk, 1,388 are medium risk, and the rest are poor risk. One bond is chosen risk? Write only a number as your

asked by sam on October 2, 2015
48. ## Math

How to obtain formula if:- Brazil's total internet users is 67510 and world's total internet users is 1544854. what is brazil's internet users as percentage of world user.

asked by JAndu on May 16, 2010
49. ## math

Seven students took a quiz. Four of these students received a score above 85 percent. Students who received at least an 85 percent got a sticker. What percent of the students (rounded to the nearest full percentage number) received a sticker?

asked by kim on January 21, 2014
50. ## math

explain and demonstrate how to change 4/20 into a percent there are two ways we can work this out 4/20 times by 5 overall to get it out of 100, becomes 20/100. or you can do 4/20 then times that by 10 or 20 x what = 100? 5, right? so multiply 4 x 5 and

asked by lreyesorg on February 11, 2017
51. ## MATH

Seven students took a quiz. Four of these students received a score above 85 percent. Students who received at least an 85 percent got a sticker. What percent of the students (rounded to the nearest full percentage number) received a sticker?

asked by Anonymous on March 24, 2012
52. ## college

Answer the problems below and show or explain how you arrived at your final answer. 1. You sell premium toasters and are making a pricing decision. At a price of \$100 (or “p = \$100”) you predict that you can sell 30 of these premium toasters at your

asked by jj on April 13, 2010
53. ## Physics

In an immersion measurement of a boy’s density, he is found to have an apparent weight of 6.86-N when completely submerged in water with lungs empty. The mass of the boy is 68.0-kg in air. The density of water is 1000-kg/m^3. a)Determine the density of

asked by Meg on October 31, 2017
54. ## math

A worker submits the following data on a timesheet: Week 1 – Total hours: 42 (including 4 hrs sick leave, 6 hrs travel) Week 2 – Total hours: 46 (including 5 hrs travel) What percentage of the recorded time did the worker spend traveling?

asked by Anonymous on July 21, 2010
55. ## chemistry

A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air

asked by emily on October 19, 2010
56. ## chemistry

A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air

asked by emily on October 19, 2010
57. ## Chemistry

You are given 1.226 g of a mixture of KClO3 and KCl. When heated, the KClO3 decomposes to KCl and O2, 2 KClO3 (s) → 2 KCl (s) + 3 O2 (g), and 246 mL of O2 is collected over water at 24 °C. The total pressure of the gases in the collection flask is 755

asked by Ash on December 7, 2016
58. ## Chemistry

Can somebody check my answers 1. If a small piece of sodium is dropped into water, it begins to react, forming hydrogen gas and sodium hydroxide. In the equation, 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g), the sodium hydroxide that is formed is a A.

asked by Amanda on August 26, 2011
59. ## stoichiometry

Ammonia gas reacts with oxygen gas according to the following equation: 4NH3 + 5O2----4NO + 6H2O a. How many moles of oxygen gas are needed to react with 23 moles of ammonia? (29 mole) b. How may grams of NO are produced when 25 moles of oxygen gas react

asked by Jonathan on February 10, 2011
60. ## math

You want to explain to your friend that your bank’s interest rate has gone down from 1.2% to 0.3%. Which sentence below has the correct meaning? A)My interest rate has decreased 25%. B)My interest rate has decreased 0.9 percentage points. C)My interest

asked by jordan on May 9, 2013
61. ## Statistics (Math 210)

Hi there, I am doing my statistics homework and am having trouble with a few problems. I sincerely appreciate any help I receive! :) According to a local chamber of commerce, in 1993, 5.9% of local area residents owned more than five cars. A local car

asked by Chris on December 5, 2016
62. ## statistics

From past experience, an airline has found the luggage weight for individual air travelers on its trans- Atlantic route to have a mean of 80 pounds and a standard deviation of 20 pounds. The plane is consistently fully booked and holds 100 passengers. The

asked by cedreana on June 18, 2011
63. ## Business Statistics

From past experience, an airline has found the luggage weight for individual air travelers on its trans- Atlantic route to have a mean of 80 pounds and a standard deviation of 20 pounds. The plane is consistently fully booked and holds 100 passengers. The

asked by Julia Brown on May 30, 2010
64. ## Statistics

From past experience, an airline has found the luggage weight for individual air travelers on its trans-Atlantic route to have a mean of 80 pounds and a standard deviation of 20 pounds. The plane is consistently fully booked and holds 100 passengers. The

asked by Mariah on October 1, 2009
65. ## Statistics

From past experience, an airline has found the luggage weight for individual air travelers on its trans-Atlantic route to have a mean of 80 pounds and a standard deviation of 20 pounds. The plane is consistently fully booked and holds 100 passengers. The

asked by JOSH on October 3, 2009
66. ## math

The lengths of what are considered "1 inch bolts are found to be normally distrubted with a mean of 1.001 inches and a standard deviation of 0.002 inches. If a bolt measures more than 2 standard deviations away from the mean, it is rejected for not meeting

asked by david on April 12, 2011
67. ## physics

A 2.00kg bullet moving at 600m/s strikes a piece of wood at rest on a frictionless table. The bullet sticks in the wood and the combined mass moves slowly down the table. a.) What is the speed of the combined mass after the collision? b.)What is the change

asked by Alex on February 9, 2012
68. ## Physics

A glass flask with a mass ok 3.00kg and volume of 1000 cm3 is completely filled with mercury and is at a temperature of 55.0oC. The flask is then lowered into an ice water bath. After thermal equilibrium is reached, (a) what percentage of the flask will be

asked by Francis on April 24, 2017
69. ## Language

Walking is for everyone Walking is a popular form of exercise, and it is growing more popular each year. Walking is good for every age group: the rate of participation does not decline in the middle and later years. In a national survey, the highest

asked by TheVroomin on December 14, 2017
70. ## science 2

6. When aqueous solutions of table salt and silver nitrate are mixed, a white solid forms. This solid is ____. (1 point)soluble a precipitate an alloy a solute 7. Stainless steel is an example of a ____ solution. (1 point)liquid-solid solid-liquid

asked by NIKE on April 17, 2012
71. ## chemistry

A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air

asked by emily on October 20, 2010
72. ## Chemistry

A student dried a wet crucible with a kimwipe. A piece of kimwipe was left clinging to the inside wall of the crucible. The student did not see the piece of kimwipe when adding the NaHCO3-KCl mixture to the crucible. The crucible and its contents were

asked by Avi on September 26, 2012
73. ## chemistry

A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air

asked by emily on October 20, 2010
74. ## chemistry

Got my as chemistry practical next week on OCR. Really stuck on it, don't know how to work out how the expected volume of CO2 is greater than that is obtained. Looked at the mark scheme ocr chemistry evalutative task specimen , but its not much help as it

asked by anonymous on March 31, 2012
75. ## Maths

Rahyu spent 2h 25 min in a library. She spent 30 min of the time reading newspapers. What percentage of her time in the library was spent reading newspapers? Round off your answer to the nearest whole number.

asked by Zayn on October 4, 2012
76. ## Math

A survey finds that 85% of the people asked use the local bus. 35.3% of those who use the bus use it at least once a week. 240 people took part in the survey. (a) Work out how many people say they use the bus once a week. (b) What percentage of the people

asked by HS on October 23, 2013
77. ## Maths

Fifty people said they liked apples or bananas or both. Forty percent of people like apples and 70% of the people like bananas. What percentage of people like only apples?

asked by Jasmine on March 29, 2017
78. ## math

salim and medha are comparing results from a 2-day lab experiment. on monday, salim's results showed that 0.907 of the perticles were charged while medha's results showed that 92% of the particals were charged. who on what day had the greatest percentage

asked by jjiiddss on February 17, 2016
79. ## Chemistry

Consider a piece of gold jewelry that weighs 9.81 g and has a volume of 0.670 cm3. The jewelry contains only gold and silver, which have densities of 19.3 g/cm3 and 10.5 g/cm3, respectively. Assuming that the total volume of the jewelry is the sum of the

asked by Anonymous on August 18, 2013
80. ## Math(Please Help Assignment Due Tomorrow)

From the length(in seconds) of 80 randomly chosen U2 songs, the mean determined was 289.6986295 and standard deviation was 76.82292002. Assume that the data is normally distributed and that the bands entire collection of songs has a mean and standard

asked by Jenny on June 23, 2016
81. ## maths/probability

q/ in a soccer match where team a has form figures of W/2 D/1 L/7 and team b has form figures of W/3 D/4 L/3 whatis the likely outcome of the match percentage wise for team a W/ L/ D/ ? if team a has form figures of W/2 D/1 L/7 and team b W/3 D4 L/3 you

asked by james on August 3, 2007
82. ## Math

Seth uses a school camera to take pictures for the yearbook and for the school paper. Last month he took 270 pictures for the yearbook and 180 pictures for the school paper with this camera. Which proportion can be used to determine p, the percentage of

asked by Ale on April 24, 2016
83. ## Economics (CHECK)

The swiss franc is selling the spot market for \$0.60, while the 90-day forward market it sells for \$0.62. (A) is the dollar selling at forward premium or discount? Discount, 0.2 (B) What is the forward premium (Discount) on the franc in percentage (at an

asked by Saday on December 10, 2014
84. ## english

Please help me to correct grammar Task 3 – Unit review (Summary and critique) According to Brown and Hood’s “Academic Encounters: Life in Society” (2002), Intermediate to High Intermediate Level, includes unit 1: Belonging to a group, consists of

asked by kar on February 11, 2010
85. ## PHYSICS(HELP)

In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a non-linear way, especially at

asked by Anonimus on January 12, 2014
86. ## PHYSICS

n the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a non-linear way, especially at

asked by Anonymous on January 13, 2014
87. ## Physics Classical Mechanics Help ASAP

In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a non-linear way, especially at

asked by Anonymous on January 10, 2014
88. ## Chemistry

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) (a) Determine the mass of gold that can be extracted if 21.4 g sodium

asked by Dovahkiin on February 19, 2011
89. ## Chemestry

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) (a) Determine the mass of gold that can be extracted if 29.3 g sodium

asked by Kenah Smith on February 7, 2013
90. ## Chemestry

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) (a) Determine the mass of gold that can be extracted if 29.3 g sodium

asked by Kenah Smith on February 7, 2013
91. ## Chemestry

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) (a) Determine the mass of gold that can be extracted if 29.3 g sodium

asked by Kenah Smith on February 7, 2013
92. ## chemistry

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted if 27.4 g sodium

asked by tg on February 7, 2010
93. ## Chemistry

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted if 27.4 g sodium

asked by tdb on February 9, 2010
94. ## Math (Statistics)

How do I go about tackling this problem? The American Medical Association wishes to determine the percentage of obstetricians who are considering leaving the profession becaose of the rapidly increasing number of lawsuits against obstetricians. How large a

asked by Edward on April 29, 2007
95. ## Math

The students at Blue Ridge Middle School are going on a field trip to the museum. By Friday afternoon 4/5 of the students had turned in their permission slips. What percent of the students had not turned in their permission slips A.4% B.20% C.45% D.80% D?

asked by Jerald on October 17, 2012
96. ## Chemistry

A sample of 1.55g of iron ore is dissolved in a acid solution in which the iron is converted into Fe2+. The solution formed is then titrated with KMnO4 which oxidises Fe2+ to Fe3+ while the MnO4- ions are reduced to Mn2+ ions. 92.95 mL of 0.020M KMnO4 is

asked by Hidayah on June 10, 2018
97. ## Chemistry

Does the reaction between CO2(g) + Mg(OH)2(aq) produce MgCO3(s) + H2O(l) or Mg(HCO3)2 ??? Normally, Mg(CO3)2 but I suspect an excess of CO2 will produce the bicarbonate. For example, CO2(g) + Ca(OH)2(aq) ==> CaCO3(s) + H2O(l) and that is often done by

asked by Fiona on June 1, 2007
98. ## chemistry

0.50g of a mixture of K2c03 and Li2c03 requires 30ml of a 0.25N hcl solution for neutralization. What is the percentage composition of the mixture? The answer k2c03 96% Li2c03 4% K2c03 weight 138g/mol 138/2 = 69 Li2c03 weight 74g/mol 74/2 = 37 30ml x 0.25N

asked by Fai on February 23, 2013
99. ## Analytical chemistry

Below i wrote a few problems, i did them all but in the book i don't have results, so i don't know if i did them right or not. I would really appreciate if someone would go through the problems and tell me if i got the right results. If i made a mistake

asked by Gloria on August 3, 2013
100. ## Math

The Davis family try shopping in a different supermarket to save money. They used their old supermarket one week, then bought the same items the next week in the new supermarket. In the first week their bill was £105.20. In the second week it was £98.50.

asked by Anonymous on November 28, 2017