# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 300
1. ## Algebra

A shingle falls straight down from the roof of a building that is 144 feet tall. a. Use a vertical motion model to write an equation that gives the height h of the shingle t seconds after it falls. b. When does the shingle hit the ground? c. If the same

asked by David on April 18, 2013

Trigonometry Questions 1. Using a compound angle formula, demonstrate that sin2π/3 is equivalent to sin π/3 2. The expression sinπ is equal to zero, while the expression 1/cscπ is undefined. Why is the identity sin(theta)=1/csc(theta) still an

asked by john on December 5, 2013
3. ## chemistry

Cl2O2 (g)---> 2ClO (g) Time [Cl2O2] (M) 0....... 6.60*10^-8 172..... 5.68*10^-8 345..... 4.89*10^-8 517..... 4.21*10^-8 690..... 3.62*10^-8 862..... 3.12*10^-8 Determine the value of the first-order rate constant. For this question, you need to graph it on

asked by Brunette on October 14, 2012
4. ## Math - Algebra

Need help understanding this problem. Looks like an exponential growth/decay. Magnesium-27 has a half life of 9.45 minutes and can be described by using the equation “y=ae^-kt . What is the decay constant (k) for Magnesium-27? How many mg of Magnesium-27

asked by Mitchel on February 21, 2018
5. ## Physic

A mass attached to a spring oscillates with a period of 3.15 s. If the mass starts from rest at x = 0.0530 m and time t = 0, where is it at time t = 6.69 s? I found online that you use the equation x = Acos(2pi*t/T) where A is the amplitude, t is 6.69s and

asked by Tory on April 4, 2010
6. ## Physics

What is the spring constant of a spring that stores 25 J of elastic potential energy when compressed by 7.5 cm from its relaxed length? I know that I should chnage 7.5 cm into .075 m. Is this equation correct? U(x)= 1/2kx^2. I should have gotten 89N/cm for

asked by Jamie on January 2, 2007
7. ## pH

im trying to calculate the pH of a 1.0L soln containing 53.8 g of completely dissociated Mg(CN)2. is this the diss. equation? Mg(CN)2 + water --> MgOH + 2CN^- i don't think i did the problem rite b/c i got 15.7 for the pH. i got 53.8M Mg(CN)2 for the

asked by christine on May 18, 2007
8. ## algebra (college)

The # N, in millions, of hearing impaired individuals of age X can be approximated by N= 0.00006x^3 + 0.006x^2 - 0.1x +1.4. Approximate to the nearest million the # of hearing impaired individuals of ages 25 and 40. 25= 1.75 and 40= 3 (those are

asked by Lacy on July 31, 2011
9. ## chemistry

Using a coffee-cup calorimeter, it is found that when an ice cube with a mass of 24.6 g melts, 8.19 kJ of heat are absorbed. (a) Calculate the change in enthalpy per gram and per mole of water. (b) Write the thermochemical equation for this physical

asked by john on November 1, 2011
10. ## Algebra

A farmer plans to enclose a rectangular region using part of his barn for one side and fencing for remaining sides. The area of the region is maximized when the width is 30 feet. a.) write an equation that could model the area as a function of the width.

asked by Kristen on September 20, 2012

A manufacturer has determined that if it sets the price of paper at x dollars per ream, then its monthly profit can be represented by the equation P = (6000 - 400x)(x - 2). Determine the y-intercept - I multiplied it out and found that the y-intercept was

asked by Carly on November 19, 2016
12. ## math

Dan receives \$375 per week for selling new and used cars at a car dealership in Oak Lawn, Illinois. In addition, he receives 5% of the profit on any sales that he generates. Write an equation that relates Dan's weekly salary S when he has sales that

asked by Loren on February 18, 2010
13. ## Calculus

Pumping stations deliver gasoline at the rate modeled by the function D, given by D(t)= 6t/(1+2t) with t measure in hours and and R(t) measured in gallons per hour. How much oil will the pumping stations deliver during the 3-hour period from t = 0 to t =

asked by Henry on February 21, 2016
14. ## Physics 11

A 1.00 x 10^4 W electric motor is used to lift a 955 kg object vertically 25.0 m at a constant velocity in 45.0 s. What is the efficiency of the motor? I did P=W/t (1.00x10^4 x 45 =W) And got 4.50 x 10^5 Then I did Ep' = Ek 955 x 9.81 x 25 = 234213.75 But

asked by Allie on January 4, 2015
15. ## AP Calculus

An Initial amount of 100 grams of Thorium-234 decays according to the model: dP/dt=-0.02828P (where t is measured in years). a) Find the equation for the amount of Thorium left after t years. b) Determine the half-life of this radioactive isotope c) How

asked by RC on October 12, 2009
16. ## Math

Adrienne had a party at a local bowling alley. She spent seventy-five dollars for the lane and five dollars per person for shoes. Let c be the total cost of the lane and shoes, and let f be the number of friends at her party. Write an equation to represent

asked by Mary on August 12, 2014
17. ## Chemistry

At room temperature (25 °C), the gas ClNO is impure because it decomposes slightly according to the equation 2ClNO(g) Cl2(g) + 2NO(g) The extent of decomposition is about 4%. Based upon this, what is the approximate value of ΔG°298 for the reaction at

asked by Jane on April 12, 2015
18. ## Chemistry

No its not a typo but I did put the wrong activation energy. Its suppose to be a certain reaction has an activation energy of 37.70kj/mol. At what kelvin temperature will the reaction proceed 3.00 times then it did at 303k? I was working the problem and

asked by Josh on July 17, 2011
19. ## MATH

Adrienne had a party at a local bowling alley. She spent seventy-five dollars for the lane and five dollars per person for shoes. Let c be the total cost of the lane and shoes, and let f be the number of friends at her party. Write an equation to represent

asked by le on May 23, 2012
20. ## Math Analysis

What is the approximate horizontal distance traveled by a soccer ball that is kicked at an angle of 30 degrees with an initial speed of 60 feet per second? a) 84 ft b) 88 ft c) 93 ft d) 97 ft e) 105 ft ==> I tried solving it by solving for x in the

asked by Emily on January 10, 2010
21. ## MATH

Adrienne had a party at a local bowling alley. She spent seventy-five dollars for the lane and five dollars per person for shoes. Let c be the total cost of the lane and shoes, and let f be the number of friends at her party. Write an equation to represent

asked by leya on May 24, 2012
22. ## MATH

Adrienne had a party at a local swimming pool. She spent fifty dollars for a pavilion and seven dollars per person for admission. Let c be the total cost of the pavilion and admission, and let p be the number of people at her party. Write an equation to

asked by leya on May 29, 2012
23. ## Chemistry

You discover a new cell type that contains measurable amounts of silver ions (Ag+) in it. You find that the concentration of Ag+ inside the cell is still 10 times lower than the concentration outside. Calculate the amount of membrane potential that results

asked by Tenshi on July 27, 2016
24. ## math

Adrienne had a party at a local bowling alley. She spent seventy-five dollars for the lane and five dollars per person for shoes. Let c be the total cost of the lane and shoes, and let f be the number of friends at her party. Write an equation to represent

asked by cha on May 15, 2012
25. ## MATH

Adrienne had a party at a local bowling alley. She spent seventy-five dollars for the lane and five dollars per person for shoes. Let c be the total cost of the lane and shoes, and let f be the number of friends at her party. Write an equation to represent

asked by leya on June 4, 2012
26. ## General Chemistry

I have two questions about this problem, I understand how it's supposed to be done but I don't understand how my teacher came to this answer, so I was wondering if somebody could confirm or deny his answer here's the problem. Below what temperature is:

asked by Vesone on April 22, 2007
27. ## Chemistry

Which of the following statements about boiling points are false: A. the boiling point of 0.1 m KF(aq) is lower than the boiling point of 0.1 m ethanol(aq) B. the boiling point of a 0.5 m aqueous solution of NaOH is the same as the boiling point of a 0.5 m

asked by Timothy on September 8, 2010
28. ## Chem Help!

Assume that a given solution caontains Ag+or Ba2+ or a mixture of both. A reasonable method for doing a qualitative analysis on this solution might be sketched out as followes (remember || means a precipitate forms and | means a solution remains. It is

asked by Anonymous. on April 6, 2014
29. ## Chem

a) An ethylene glycol solution contains 21.1 g of ethylene glycol in 86.0 ml of water. compute the freezing point of the solution. b) Compute the boiling point of the solution.

asked by Emilene on March 13, 2011
30. ## Edited questionSCIENCE

Speeds up or slows down? By stirring a gas in a liquid, its solubility ____________ the dissolving process. High or low? A gas's solubility is is faster in a liqud when under __________ pressure. How do the methods of speeding the rate of solution for

asked by Twilight lover on March 10, 2009
31. ## chemistry

2H2O2 --> 2H2O +O2 If a 250mL bottle of hydrogen peroxide solution containing 3% H2O (by mass) completely decomposed how many liters of gas would it generate. Assume that one mole of gas occupies a volume of 22.4 L and that the density of the solution is 1

asked by Anonymous on October 6, 2009
32. ## chemistry

What will be the final pH value if you mix 50ml HCl (aqueous solution, pH=0.5) and 40ml NaOH (aqueous solution, pH=12). Hint: convert pH value to concentration of acids/base, then consider the neutralization reaction, then find out the resulting pH value.

asked by Anonymous on April 4, 2013
33. ## o chem

Impure acetanilide was dissolved in the required amount of hot water. The clear solution in a beaker was immediately placed in an ice-water bath, instead of being allowed to cool down slowly. What would be the result of cooling the solution in this manner?

asked by happy on October 18, 2013
34. ## chemistry step by step thank a lot

Al2(s04)3 solution of a molal concentration is present in 1 litre solution of 2.684g/cc. How many moles of bas04 would be precipitated on adding bacl2 in excess? the answer 6M Who helps me step by step for me clearly I am thankful to all tutors

asked by ken on July 11, 2014
35. ## Qualitative analysis

A solution reacts with calcium carbonate to produce a gas. It does not produce a precipitate with either aqueous barium chloride or acidified silver nitrate. Which of the following does the solution contain? A HI B H2S04 C HNO3 D HCl Could someone explain

asked by Cheezel on November 17, 2016
36. ## Math

Solve the system of equations using the addition (elimination) method. If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is "no solution" or "infinitely many solutions" and state how you arrived

asked by Gail on March 24, 2009
37. ## chemistry

A 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 mL of distilled water and titrated with a 0.050 M solution of NaOH. The pH of the solution was monitored throughout the titration, and the following data were collected. Determine the

38. ## chemistry

Indicate the concentration of each ion present in the solution formed by mixing the following. (Assume that the volumes are additive.) (a) 50 mL of 0.100 M HCl and 10.0 mL of 0.510 M HCl (b) 15.0 mL of 0.309 M Na2SO4 and 38.6 mL of 0.200 M KCl (c) 3.50 g

asked by Anonymous on September 21, 2011
39. ## Chem

Depending upon the tip of a dropper pipet, there are approximately 20 drops per milliliter of water. The experimental procedure indicates the addition of 5-10 drops of each solution to the test tubes. Calculate the volume range in milliliters for the

asked by Robert on October 10, 2015
40. ## Chemistry

A 1.00% by mass MgSO4(aq) solution has a freezing point of -0.192°C. (a) Estimate the van't Hoff i factor from the data. (b) Determine the total molality of all solute species. (c) Calculate the percentage dissociation of MgSO4 in this solution. Can

asked by Daiyo on December 10, 2010
41. ## chemistry

the much used drug cocoaine is an alkaloid. Alkaloids are noted for their bitter taste, and indication of their basic properties. Cocaine, C17H21NO4 is soluble in water tot he extent of 0.17 g/100 ml solution, and a saturated solution has a pH of 10.08.

asked by Symone on December 5, 2010
42. ## Algebra

These are the three questions that I'm struggling with. Question 2 is a matter of terminology. Questions 1 and 3 are just difficult for me to decipher through and are causing me some confusion. (The initial set of directions apply to each question). 1.

asked by Elizabeth on January 13, 2015
43. ## physics

A 16000 kg sailboat experiences an eastward force of 17700 N due to tide pushing its hull while the wind pushes the sails with a force of 87500 N directed toward the northwest (45 degrees westward of North or 45 degrees northward of West). What is the

asked by Rebecca on March 24, 2011
44. ## Physics

1. How much energy is required to be removed to lower the temperature of a bottle of drinking water (280mL) from 22°C to 4°C? The density of water is 1.0g/mL here are the equations we can use: (-m1)(C1)(ΔT1)=(m2)(C2)(ΔT2) Q=mcΔT Q=mL There might be

asked by Tina on July 5, 2011
45. ## math

Fun Lanes Bowling charges a fee of \$4 to use their shoes and \$6 for each game played. Salim wants to figure out how much it will cost him to bowl. Part 1: Write an equation representing this problem. Let x be the number of games bowled, and let y be the

asked by drea on August 10, 2011
46. ## Calc.

I am so confused with this last part of the unit! What in the world is going on: Use normal vectors to determine the interaction, if any, for each of the following pairs of planes. Give a geometric interpretation in each case and the number of solutions

asked by Derek on July 9, 2008
47. ## Chemistry 2 Ap

The reusably booster rockets of the U.S space shuttle employ a mixture of aluminum and ammonium perchlorate for fuel. A possile equation for this reaction is 3Al+3NH4CLO4---> Al2O3+ AlCl+ 3NO+ 6H2O What mass of the NH4CLO4 should be used in the fuel

asked by jecce. on September 4, 2008
48. ## physics

A jet plane pilot decides to accelerate horizontally. If the thrust of the engine is increased to 50 000 N at a time when the air resistance ( or drag) acting on the 4000kg plane amounts to 30 000 N , what will the planes acceleration be I believe you at

asked by Melissa on March 25, 2012
49. ## math

when we mix a 10% acid solution with a 14% acid solution, we can obtain a solution that is 24% acid

asked by Sheena on June 13, 2012
50. ## math

A nurse has a 30% alcohol solution and an 80% alcohol solution. He needs 10L of a 40% alcohol solution.

asked by Caitlyn on November 3, 2017
51. ## math

How much of 20% alcohol solution and 50% alcohol solution must be mixted to get 9 liters of 30% alcohol solution?

asked by terry on November 9, 2015
52. ## Math

How much of 20% alcohol solution and 50% alcohol solution must be mixted to get 9 liters of 30% alcohol solution?

asked by BoB on July 27, 2011
53. ## chemistry

A flask containing 5.00mL of 3 M HCl solution requires 14.45mL of 1.00 M NaOH for titration. How many moles of HCl are present in the solution? The density of 3 M HCl is 1.05g/mL

asked by John on June 13, 2010
54. ## chemistry

A flask containing 5.00mL of 3 M HCl solution requires 14.45mL of 1.00 M NaOH for titration. How many moles of HCl are present in the solution? The density of 3 M HCl is 1.05g/mL

asked by John on June 12, 2010
55. ## chemistry

A solution of HClO is mixed and found to have a pH of 4.53. Find what the initial concentration of HClO was for this solution. Ka = 3.00 × 10−8 for HClO. Answer in units of mol/L please help this is due in 1 hour

asked by Anonymous on January 28, 2015
56. ## chemistry

For the diprotic weak acid H2A Ka1=2.1x10^-5 and Ka2=5.5x10^-7. What is the pH of a 0.0800M solution of H2A? What are the equilibrium concentrations of H2A and A^2- in this solution?

asked by ice cream on October 12, 2012
57. ## Chemistry

Have a 15 ml Hexane solution that needs to be placed in rotovap to evaportate Hexane. Hexane Solution temperature must be maintained at 22-25 F to prevent degradation of active. What should the pressure (mm Hg) be set at for this to occur?

asked by Chicago on August 30, 2011
58. ## chemistry

What is the function of each of the following reagents in this experiment: phosphoric acid; anhydrous sodium sulfate; sodium carbonate solution, and saturated sodium chloride solution

asked by Anonymous on November 13, 2011
59. ## chemistry

In the laboratory a student combines 25.9 mL of a 0.223 M magnesium bromide solution with 23.3 mL of a 0.615 M magnesium acetate solution. What is the final concentration of magnesium cation ? ..... M

asked by ? on October 9, 2014
60. ## Biology

How does chloroplasts move when placed in a different solution? I understand that chloroplasts are just randomly scattered through out the cytoplasm, but what does placing the cell in a different solution that can be hypotonic or hypertonic affect the

asked by Lily on October 24, 2015
61. ## chemistry

30 ml of sugar syrup is mixed with water to yield a concentration of 60% sugar solution. What is the volume of the solution? The sugar has a molecular formula of c12h22o11 and a mass of 12g.

asked by Helena on December 15, 2013
62. ## Math

Given that x²cos y-sin y=0 ,(0,π): a)verfiy that given point is on the curve. b)use implicit differentiation to find the slope of the above curve at the given point. c)find the equation for tangent and normal to the curve at that point.

asked by Abdullah11 on March 23, 2017
63. ## Math

Three linear equations are given below. The first is in slope intercept form, the 2nd is in point-slope form and the 3rd is in standard form. Each equation has a slope. What is the sum of the three slopes. 1.y = -2x + 5 2.y + 7 = 6(x − 3) 3.4x − y = 9

64. ## Math

Eli has 36 books. He places the same number of books on each of 9 shelves. Which equation below could be used to find the number of books on each shelf? A 36/ ___=6 B ___ x9=36 C 36/6 = ___ D 6x9=____ Plz help..thanks

asked by Pam on February 12, 2016
65. ## Math

The volume of a suitcase is 1,200 cubic inches. Its length is 20 inches, and its height is 10 inches. What is the width? Write an equation to represent the width. Then find the width of the suitcase.

asked by Anonymous on May 1, 2018
66. ## algebra

Seven inches are equivalent to 17.78 cm. Find the equation converting length in cm to length in inches. What is the length in inches of a 96.2 cm bar? 17.8cm =7 in. 1cm = (7/17.78)in 96.2cm = 96.2 (7/17.78)in 96.2cm = 37.874 in can this be graphed and how?

asked by p eg on February 26, 2011
67. ## math

Julius sold 5x as many computers as Sam sold last year. In total they sold 78 computers. How many computers did Julius sell. **Solve each problem by WRIING and solving the equation.

asked by sheila on November 13, 2013
68. ## Math

A 10 year old has a heart rate of 210 and a 15 year old has a heart rate of 205 and so on. Right an equation that can be used to find the maximum heart rate for any age. It says the relationship is linear if that helps.

asked by Paige on March 10, 2012
69. ## chem

Using the balalnced chemical equation, how many grams of MgO are produced when 31.0 grams of O2 react completely with Mg? 2 Mg + O2 → 2 MgO Molar Mass Mg = 24.3 g/mol O2 = 32.0 g/mol MgO = 40.3 g/mol 55.7 78.1 89.1 111.3

asked by chris on October 16, 2016
70. ## Chemistry

Methyl linoleate is one of the common components of biodiesel. As an alternative fuel, Methyl linoleate reacts completely with oxygen (O2) to make carbon dioxide and water. Balance the chemical equation. How many kilograms of oxygen are required to react

asked by Shell on May 19, 2011
71. ## Algebra

Suppose you want to determine the number of miles you can drive in your car. Your car gets 20 miles per gallon. The number of miles traveled varies directly with the number of gallons of gas the tank holds. Write a direct variation equation that represents

72. ## Algebra

Suppose you want to determine the number of miles you can drive in your car. Your car gets 20 miles per gallon. The number of miles traveled varies directly with the number of gallons of gas the tank holds. Write a direct variation equation that represents

73. ## Geometry

Williamston Daily is a new daily newspaper. When they first started printing three years ago they had 5700 home delivery subscribers. The number of subscribers increases by 67 every month. Write an equation that shows the relationship between the number of

asked by aleah on November 22, 2009
74. ## Chem Problem

I originally asked you the first question and I got the answer 7.7 but theres other parts to the problem but Im not sure what to do In the preparation of a mustard solution, an individual package of mustard was emptied into a beaker and the mass was

asked by Kelli on October 10, 2012
75. ## Chem Problem

I originally asked you the first question and I got the answer 7.7 but theres other parts to the problem but Im not sure what to do In the preparation of a mustard solution, an individual package of mustard was emptied into a beaker and the mass was

asked by Kelli on October 10, 2012
76. ## Science (atoms) 8th grade

Speeds up or slows down? By stirring a gas in a liquid, its solubility ____________ the dissolving process. High or low? A gas's solubility is is faster in a liqud when under __________. How do the methods of speeding the rate of solution for dissolving a

asked by Twilight lover on March 10, 2009
77. ## Science

Speeds up or slows down? By stirring a gas in a liquid, its solubility ____________ the dissolving process. High or low? A gas's solubility is is faster in a liqud when under __________. How do the methods of speeding the rate of solution for dissolving a

asked by Twilight lover on March 10, 2009
78. ## chemistry

I know everyone guessed i had a few more i couldn't do. Sorry but assistance please: 1.Sucralfate (molecular weight: 2087g/mol) is a major component of Carafate® which is prescribed for the treatment of gastrointestinal ulcers. The recommended dose for a

asked by mikey on November 17, 2015
79. ## Chemistry

A student placed 17.0 g of glucose (C_6H_{12}O_6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100 mL mark on the neck of the flask was reached. The flask was then shaken

asked by Tiffany on July 7, 2010
80. ## chem

(5) In this experiment MnO4-is reduced to Mn 2+ by the unknown. What is the equivalent weight of MnO4- for this experiment? 52.68 (6) How many equivalents of electrons were transferred from the unknown solution? (7) What is the Normality of the 1.00 mL of

asked by bry on October 27, 2011
81. ## Biology

In class, I did an experiment with water and iodine solution in a beaker and also starch in a dialysis tube tied and placed in the beaker. There were discussion questions I couldn't answer surely... please check my answers. 1. a)Use your results to

asked by CrissyXD on April 3, 2012
82. ## college

With an equation p(X=x)=e to the-lambda *lambda to the x/x how do you isolate for lambda if you know p ?

asked by Jim on September 28, 2008
83. ## algebra

solve the equation for x -2(2x-2)=2x for y 9x+y=9 solve theinequality 2x-6

asked by gary on November 8, 2014
84. ## Math

How to solve this equation Log [log (log x)] =1 5 4 2

asked by Hyde on May 6, 2014
85. ## Physics

A block of mass m is projected at speed Vo up a rough plane inclined at an angle theta to the horizontal. Model the block as a particle and assume that the frictional force acting is given by kv^2, where v is the block's speed and k is a constant. What is

asked by Anonymous on May 13, 2012
86. ## Chemistry

a 15.00mL sample of NaOH was titrated to the stoichiometric point with 17.40mL of 0.2340M HCl. a) what is the molar concentration of the NaOH solution? b)calculate the grams of NaOH in the solution.

asked by prince on December 9, 2010
87. ## Chemistry

A stock solution of sulfuric acid must be diluted by adding 25.0mL of 7.50M H2SO4 to enough water to make 500mL of diluted soultion. What is the concentration of the diluted solution?

asked by Anonymous on October 10, 2016
88. ## AP Chemistry

The normal boiling point of methanol is 64.7°C. A solution containing a nonvolatile solute dissolved in methanol has a vapor pressure of 642.3 torr at 64.7°C. What is the mole fraction of methanol in this solution?

asked by Anonymous on April 22, 2016
89. ## chemistry

if BaSo4 was precipitated in solution contain 0.012 M NaCl and 0.002 M BaCl2 .calculate the sulfate concentration which is sufficient for saturate the solution with BaSo4 , if you now that the Ksp for BaSo4 equal to 1*10^-10 .

The cell potential of the following electrochemical cell depends on the pH of the solution in the anode half-cell: Pt(s)|H2(g,1atm)|H+(aq,?M)||Cu^2+(aq,1.0M)|Cu(s) what is the pH of the solution if Ecell is 375 mV? I first got .65 as my pH, but it said

asked by clara on March 30, 2013
91. ## Math

Consider the pair of linear equations below. 4x+6y=12 2x+3y=6 What is the relationship,if any, between the two equations Does the system of equations have one solution, no solution, or infinitely many solutions.Explain How can you verify your answers to

asked by Jupiter on April 21, 2019
92. ## chemistry

An AgNO3 solution (44 mL/0.44 M) has been mixed with an NaCl solution (83 mL/1.35x 10^-2 M) a)Determine the ion product of the precipitate(potential precipitate) b) Would a precipitate be created? The Ksp of AgCl(s) proves to be 1.8 x 10^-10

asked by Joseph on April 9, 2008
93. ## CHEMISTY

Determine the molarity of sodium cations in solution when 6.21 g of sodium sulflate are mixed with 2.97 g of sodium nitrate in pure water to produce 350.0 mL of solution.......please explain every step. thanks!

asked by Jenni on December 13, 2010
94. ## chemistry

A piece of Al weighing 2.7g is titrated with 75 mL of H2SO4 (sp.gr. 1.18 g/mL and 24.7% H2SO4 by mass). After the metal is completely dissolved the solution is dilute to 400mL. Calculate molarity of free H2SO4 in solution.

asked by jaimi on April 17, 2015
95. ## Chemistry

(a) A 102-g sample of water is placed in an insulated container and allowed to come to room temperature at 21°C. To heat the water sample to 41°C, how much heat must you add to it? kJ (b) Consider the hypothetical reaction, being run in an insulated

asked by Lance on June 7, 2011
96. ## science(chem)

I synthesized Nylon in my lab for organic chem. I need help figuring out the theoretical yield so I can compare it to my product that I synthesized. I looked up the reaction online on Google by typing in "Synthesis of adipoyl chloride and nylon 6.6." I

asked by ~christina~ on February 16, 2008
97. ## AP CALC

1.Suppose the amount of water collected from a mountain spring decreases over the summer at a rate of 1.5% per day. When will the spring's output fall to four-fifths its present level? Select one: a. 61.086 days b. 34.055 days c. 14.876 days d. 3.347 days

asked by Rachel on April 5, 2015

A light spring of constant k = 170 N/m rests vertically on the bottom of a large beaker of water. A 5.70 kg block of wood (density = 650 kg/m3) is connected to the spring and the mass-spring system is allowed to come to static equilibrium. What is the

asked by julie on December 20, 2010
99. ## physics

Could anyone help me set up this equation? I drew my force body diagram but wasn't sure how to include the downward force (im assuming i use either sine or cosine?) A force of 340 N pushes a 54 kg object. Find the acceleration of the box if the force makes

asked by xxhennessy on October 3, 2014
100. ## Chemistry

Calculate the molarity and the molality of an NH3 solution made up of 30 g of NH3 in 70 g of water. The density of the solution is 0.982 g/ml. Molar Mass of NH3 = 17.04 g

asked by Sara on December 2, 2010