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March 28, 2015

Search: 14 carat gold has a purity of 58.3%. How many moles of gold are in 154 grams of 14 carat gold? Answer in

Number of results: 58,408

Chemistry
How many moles of NaOH per liter of solution would you expect to have in a solution that is labeled "0.105 M NaOH" on the side of the gradulated cylinder?
March 15, 2012 by Carla

Chemistry
A 6.00 ft cylinder has a radius of 26 in. It contains 189 lb of helium at 25 celsius. Express the volume of the cylinder (V=ðr²h) in liters, the amount of helium in moles and the temperature in Kelvin.
September 27, 2012 by Wendy

Physics Help!
Gas is contained in an 8.45 liter vessel at a temperature of 19.8oC and a pressure of 8.70 atm. Determine the number of moles of gas in the vessel. Do not enter units.
November 6, 2012 by Emily

Chemistry
It is calculated that 0.0191 moles of CO2 are expected from a reaction at 25 degrees C and 1 atm. What volume of CO2 does this represent in cm3? (R = 0.0821 L atm / K / mol)
November 26, 2012 by Jack

chem
Calculate the number of moles of solute present in each of the following solutions. a) 39.0 mg of an aqueous solution that is 1.00 m NaCl b)90.0 g of an aqueous solution that is 2.10% sucrose (C12H22O11) by mass.
January 19, 2013 by Samantha

science
how many oxygen atoms are in 773.2g of carbon dioxide? and also what is the molar mass of an element where 3.4 moles of the element has a mass of 669.69g? which elent is it?
May 6, 2013 by wardy

Chemistry
The rusting of iron is represented by the equation 4Fe+3O2=2Fe2O. A 1.45-mol sample of iron, how many moles of Fe2O3 will there be after rusting has completed.
November 23, 2014 by keisha

chemistry
Given the following balanced chemical equation, if 15.4 g AgNO3 are reacted, how many moles of AgCl are produced? 2 AgNO3 + BaCl2 → 2 AgCl + Ba(NO3)2
March 1, 2015 by anna

Chemistry
How do I solve this problem - i37_tinypic_com/qqeo8w.jpg (replace the underscore with a dot) It gives the pressure, volume, and temperature and the only formula that has all those values is PV=nRT but I don't know where to get the number of moles since it doesn't give any ...
October 17, 2009 by .

Chemistry 1151
i have been trying for a few hours now to solve this, but i missed tis day in class and my mind wont wrap around the concept. can someoneplease help?? How many moles of Neon are in a 25mL container at STP?
October 6, 2010 by Sydney

chemistry
using the titration equation below calculate the number of moles of molecular iodine (I2) that must have reacted with the sodium thiosulfate I2(aq)+2S2O3^2-(aq) ---->S4O6^2-(aq)+2I-(aq) Can someone plz help me to figure this out with steps and explanation if possible thanks =]
November 16, 2011 by Yul

math
Can someone please check my work? Solve using substitution method 1. 3x+2y=12 x=52-6y answer:-40.8 I am pretty sure that one is wrong. Solve using elimination method 2. 2r-7s=-31 7r+2s=24 answer: (230/53,-468/53) 3.3x+4y=3 6x+8y=6 answer: No answer. problems eliminate eachother
January 6, 2009 by deedee

SCI HW CHECK
D. Name the joint shown in each picture 1. Elmbow answer - Antecubital fossa. 2. wrist answer - carpal 3. shoulder answer - glenohumeral 4. neck vertebras answer - ????????????????? what is the joint in your neck vertebrae called?????????? can you check to see if im correct
April 22, 2012 by Laruen

Science HW Check
D. Name the joint shown in each picture 1. Elmbow answer - Antecubital fossa. 2. wrist answer - carpal 3. shoulder answer - glenohumeral 4. neck vertebras answer - ????????????????? what is the joint in your neck vertebrae called?????????? can you check to see if im correct
April 22, 2012 by Laruen

Math
Evaluate the expression. (1)1/3 divided by 1/6= 2 Answer (2)6 divided by 2/5= 15 Answer (3) 4/9 divided by 2/3 dividied by 5/6= Answer 4/5 (4) 7/8 mulitplied by 4/5 divided 7/20=Answer 2 Please help Ms. Sue
October 9, 2012 by Cindy

Spanish
My answers were incorrect. These were the instructions. Choose the correct form of the following verbs in the pretérito perfecto: Ayer _______ toda la tarde (all afternoon). My answer neivo. Anoche María y yo _______ una mila (mile) My answer corrieron. Mi jefe no me _______ (...
June 9, 2010 by Lexie

French
Could you check these thanks Directions: Answer as indicated, using the pronoun en. Part 1 1. Tu as de l'aspirine? Answer: Oui, j'en ai. 2. Tu as du sirop? Answer: Non, je n'en ai pas. 3. Tu as des médicatments? Answer: Non, je n'en ai pas. 4. Tu as de la pénicilline? Answer: ...
January 15, 2010 by Rachel

Chemistry/Equilibrium calculations
Hi! Thank you so much for your answer! according to my calculations...I got: 1 bar = 750 mm Hg = 0.986 atm. At constant T and P, volume and moles are proportional, so volume percent = mole %. Pa = (xa)(Pt) , , ,the partial pressure of "a" is equal to the mole fraction of "a" ...
August 16, 2008 by Mary

Algebra II
Please check the following: Solve log4(m-3)+ log4(m+3) =2 Answer: 1 Solve 6^3n=43^5n-4 Answer: 1.1202 Solve 5^2x+1>=50 Answer:x>=4.5000 Use common logarithms to approximate log9(207) to four decimal places. Answer: 2.4270 Ealuate: In e^-9x Answer: -9x Solve 4+3e^5x = 27 ...
March 29, 2008 by Lucy

Chemistry
To illustrate the calculation, assume that 21.95 mL of a thiosulfate solution is required to reduce the iodine liberated by 20.85 mL of 0.0200M KIO3 and that 18.63 mL of the same thiosulfate solution reacts with the iodine replaced by 20.00 mL of an unknown solution of sodium ...
April 26, 2013 by Marcus

English
Write the vocabulary word from the word box that matches each idea. Communicate - flick - alert- signal - chatter - grooms. 1/.............to make neat and clean . Answer: grooms 2/............. to tell a person or animal something. Answer: communicate 3/ .............to warn ...
February 15, 2014 by NA

Pre-calculuc-check answer
Which is true for the graph of f(x)= -x^3+3x-2? Answer: relative maximum at (1,0) 2) Determine between which consecutive integers one or more real zeros of f(x)= 3x^4+x^3-2x^2+4 are located. Answer: -1 and 0
August 23, 2008 by Lucy

Physical Science
I have a question and the answer, but I need to know how to get to the answer. Thanks What is the frequency, in hertz, of a sound wave (v=340 m/s) with a wavelength of 0.20 m? answer is 1.7 103 Hz (there is a box symbol after 1.7 and the 3 is superscript)
July 12, 2010 by Sam

chemistry
Assuming pressure and temperature remain constant, what happens to the volume of a gas if the number of moles of gas is increased (gas is added)? 1) Remains the same 2) Cannot be determined 3) Increases 4) Decreases
April 8, 2008 by aaloy

Chemistry
Gunpowder is a mixture of potassium nitrate, sulfur and carbon in the proportion by mass of 6:1:1 (KNO3:S:C). A typical rifle shell contains 3.0g of gunpowder. How many moles of each component are there in our sample of gunpowder?
October 20, 2009 by L

chm
gunpowder is a mixture of potassium nitrate , sulfur and carbon in th proportion (by mass) of 6:1:1 (KNO3;S:C). A typical riflr shell contains 3.2 gunpowder. How many moles of each compnent are there in our sample gunpowder?
October 27, 2009 by Brittany

Chemistry(Urgent, please help)
I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation. 2S2O3^2- + I2 -> 2I^- + S4O6^2- Would the # produced be 2 for I2. I am not sure what to use for L?
February 26, 2012 by Hannah

chemistry
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution before the addition of any KOH. The Kb of NH3 is 1.8 × 10-5. I thought that I would need a second volume to find the moles of NH3?
November 6, 2014 by Sydney

Math(Please check answers)
1) Solve the equation: 15(7x-6) = 3x-5 My answer is (-85/108) 2) Mary and her brother collect coins. Mary has 4 times the number of coins that her brother has. Together they have 175 coins. How many does Mary have? My answer is 140 3) Perform the indicated operations. Express ...
September 5, 2010 by Hannah

Chemistry
For the following reaction, what is the approximate value of Delta H? CH4(g) --> CH3(g) + H(g) I figured it out.. C-H = 411 4 moles on one side 3 on the other so [4*411]-[3*411] = 411
February 25, 2007 by Wade

chemistry
how many moles of oxygen atoms does 1.2x10^25 diphosphorus pentoxide molecules have? hwo many oxygen atoms are in 1.25 mol sulphur trioxide? i dont understand these
December 4, 2008 by lisa

Chemistry
I am not really sure how to do this: Calculate the pH when 1.0*10^-3 moles of solid NaOH is added to a) One liter of 9.1*10^ -6 M HCL b) One liter of a solution containig 0.05 M CH3COOH and 0.1 M CH3CooNa
August 11, 2009 by Saira

chemistry
Calculate the energy change expected from the reaction of one mole of hydrogen with one molde of chlorine to form two moles of hydrogen chloride
January 21, 2010 by Shift

chemistry
Calculate the energy change expected from the reaction of one mole of hydrogen with one molde of chlorine to form two moles of hydrogen chloride
January 21, 2010 by Shift

Chemistry
Alum is a hydrated compound containing 45.5% water. How many moles of water are contained in one mole of this hydrate. Data for alum M= 474 g∙mol-1
April 8, 2010 by Dan

Organic Chemistry
If fructose, glucose, and sucrose are the only carbohydrates in honey, how could you use Benedict's reagent to determine the number of moles of sucrose in a 1.0g sample of honey?
March 8, 2011 by Sophia

Chemestry
A 1L of buffer was prepared from 0.15 mole of Na2HPO4 and 0.10 moles KH2PO4. a) What is your pH and what is the pH change that adding of 80.0 mL of 0.100 mol L-1 NaOH cause? b) What happen to the pH after adding 10.0 mL of 1.0 mol L HNO3-1.
April 28, 2011 by Margo

CHEMISTRY
If the OH ion concentration in an aqueous solution at 25 celsius is 3.4x10^-3 M the the H concentration in moles per liter in the same solution is? answers is 2.9x10^-12 i do the -log and i get 2.46 i dont know that else
October 26, 2011 by HELPP

chemistry
Nitrous Oxide(N2O), or laghing gas, is mommonly used as a anesthetic in denistry and surgery. How many moles are present in 8.4 liters of nitrous oxide at STP?
December 14, 2011 by Meteknesh

physics
Suppose 2 moles of an ideal gas are enclosed in a container of volume 2.70·10^4 m^3. The container is then placed in a furnace and raised to a temperature of 390 K. What is the final pressure of the gas?
December 27, 2011 by maria

Chemistry
Concentrated hydrochloric acid has a concentration of 12.1 moles per liter. how many milliliters of the concentrated acid should be used to create 3.25L of a 0.100M solution?
May 20, 2012 by Lindsey

Chemistry
Suppose 1 gram of Li2CO3 is reacted with in 50.0 mL of 3.00 M HCl. What would be the mass of CO2 liberated in the reaction? After the reaction, how many moles of HCl are left over?
October 7, 2012 by Anonymous

college chemistry
for my lab i used 2.0mL of NaOH solution and it doesnt have a density in (g/mL)... is there still a way to calculate the moles to it? unless there is a density to NaOH
March 19, 2013 by Anonymous

chemistery lab..urgent
hi..can someone hwlp me out here on how we can calculate the moles of H2T(phthalic acid)?? its urgent for my lab this evening 1:00pm friday
September 18, 2014 by marcus

Math 8R: Homework Check - Part 3
Part 3 : Evaluate when x = -2, y = 5 21. 4x + 2y, Answer: 2 22. 3(x) *to the 3rd power*, Answer: -221 23. (x + y) *to the 2nd power*, Answer: 9 24. -4x + 2y, Answer: 18 Please check to see if my answers are correct. Thank You!!! :)
October 29, 2012 by Laruen

A.P Chemistry
Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X 64.8% ? Y 73.0% 104. Z 59.3% 64.0 (a) the vapor...
October 23, 2006 by T-Baby

chemistry
how many moles of potassium carbonate will be produced if 400.0 g of potassium hydrogen carbonate are heated
October 6, 2009 by Tierney

chemistry
The molar mass of magnesium carbonate, MgCO3, is 84 g/mole. How many moles are in 12.60 g of magnesium carbonate?
December 5, 2009 by brianna

chemistry
What is the mass of 0.425 moles of CaCl2? The molar mass of CaCl2 is 110.98 g/mol.
February 19, 2010 by Jessica

Chemistry.
If 6.02 moles of potassium react with a 0.8 M silver acetate solution, how many L of silver acetate are needed?
March 5, 2012 by Victoria

Chemistry.
If 6.02 moles of potassium react with a 0.8 M silver acetate solution, how many L of silver acetate are needed?
March 5, 2012 by Victoria

chemistry
If a sample of NH4NO3 contained 5.04 x 1022 hydrogen atoms, how many moles of NH4NO3 are in your sample?
April 27, 2013 by Anonymous

chemistry
A Can of CO2 contains 5.75gmolecules of CO2. Calculate (a)number of moles of CO2 (b) mass of CO2.
May 1, 2014 by maris

chemistry
If 4.8 liters of a 2.8 M solution of NaCl then the solution will have *Blank* moles of NaCl dissolved in it.
May 27, 2014 by Griffin

calculus
Find the linearization of the function below at x = π/3.? y=sin(x)/x Your answer should be a linear function of x where the coefficients are accurate to at least two decimal places. You can enter π in your answer as "pi" (without the quotes). I am not able to figure ...
October 14, 2010 by Vick

calculus
Find the linearization of the function below at x = π/3.? y=sin(x)/x Your answer should be a linear function of x where the coefficients are accurate to at least two decimal places. You can enter π in your answer as "pi" (without the quotes). I am not able to figure ...
October 14, 2010 by john

chem
how is the oxide of arsenic worked out when its in its gas state please help im flumuxed Please clarify your question? What do you mean by "worked out? the question states determine the molecular formular of the oxide of arsenic when it is in its gaseous state evidence arsenic...
January 30, 2007 by donald

Evironmental science
Give an example of a population (other than people)that could be found in a backyard(Be specific). Check your own backyard. Look for insects, moles, birds, grubs, grasses, and wildflowers (like dandelions).
September 9, 2006 by Susie

chemistry
one moles of a compound containing only carbon, hydrogen, and nitrogen was burned in the presence of excess oxygen to give 264g of CO2, 63 g of H20, and 46 g of NO2. Calculate the molecular formula of the compound.
September 16, 2007 by julie

chem
consider seperate 1Lsamples of He and UF6 both at 1 atm and containing the same number of moles. what ratio of temps for the two samples would produce the same root mean square velocity?
November 16, 2007 by mel

Chem.
2SO2(g) + O2(g) ---> 2SO3 It says that 12.0 L of sodium trioxide are produced at 100 degrees celcius. What volume of oxygen is produced? How would I go about doing this. I was going to use PV=nRT but I dunno the pressure so I can't find the moles. What do I do?
December 11, 2008 by Lena

chemestry
how do you solve the ideal gas law when you are given the temperature in celcius instead of kelvin. Heres an example question. Calculate the volume occupied by 3.25 moles of carbon dioxide at 25degrees celcius and 750mm Hg.
January 11, 2010 by hellogoodbie

Chemistry
Suppose 49.6 mL of 0.242 M CoCl2 solution is added to 23.8 mL of 0.361 M NiCl2 solution. Calculate the concentration, in moles per liter, of each of the ions present after mixing. Assume that the volumes are additive. I'm not sure what to do! Thank you!
May 9, 2010 by Michael

chemistry
a) show a balanced neutralization reaction for each. b) Determine how many moles of base are needed to neutralize 2 mles of acid of these reactions. Can you show me the work,using the mole ratio ?? HNO3 + KOH -- H2SO4 + NaOH --
August 16, 2010 by Kelsey

chemistry
Consider the following reaction: 2H2S (g) + 3O2 (g) --> 2SO2 (g) + 2H2O (g) If O2 was the excess reagent, 1.3 moles of H2S were consumed, and 18.7 g of wat were collected after the reaction has gone to completion, what is the percent yield of the equation?
December 11, 2011 by :(

ap chemistry
How much heat is released if 2.00 moles CF2Cl2 reacts with 70.0 g F2 with a 75.0 percent yield? CF2Cl2 + F2 ! CF4 + Cl2 H for this reaction is -401 kJ/mol rxn. 1. 553 kJ 2. 739 kJ 3. 985 kJ 4. 601 kJ 5. 1069 kJ 6. 802 kJ
October 31, 2012 by cheri

CHEMISTRY
18cm^3 of 1.0M H2SO4 just reacted with 24cm^3 of 1.5M NaOH to form sodium sulfate & water. Calculate the amounts in moles of sulfuric acid & sodium hydroxide reacting & write an equation for the reaction.
October 12, 2013 by Janey

Chemistry
How many moles of solid Mg(OH)2 should you add to 200mL of 0.15M lactic acid solution to produce pH 4.0 buffer? -I don't know how to do this w/0 knowing pKa, but I don't think the point is to look up pKa. Is there some other way to solve this?
October 14, 2014 by Me

Algebra 1
11) Tell which real number corresponds to the situation. During a quiz, a person loses 1800 pts. answer: -1800 12) Solve for y z=yq Answer: z-q=y 13) Solve using the multiplication principle 10x=-90 Answer: x= -9 14) Collect like terms 20w+w+14/19w Answer: 413w 16) A mountain ...
November 5, 2008 by deedee

Chemistry
How mcuh heat is needed to raise the temperature of 80 grams of water by 30 degrees? I got AlphaQ=80xCx30. I know I'm solving for Alpha , but I don't know what the C would be or how to find it. Thanks for your help.
June 3, 2009 by Narasaq

7th grade
if 60 grams of potassium chlorate is dissolved into 100cm3 of water at the temperature of 60 degrees celsius is the solution saturated unsaturated or supersaturated?
February 19, 2010 by sean

Chemistry 2 ap
How much heat energy is produced when 31.6 grams of propane are burned? I asked my teacher and she said it would be a stochiometry problem but im still confuded:/
October 28, 2010 by Peanut

Chemistry 104
What mass (in grams) of calcium carbonate is needed to react completely with 73 mL of 0.10 M HCl according to 2HCl + CaCO3 --> CaCl2 + H20 + CO2?
November 11, 2010 by Brenna

chemistry
if 3.86x 10^22 atoms of aluminum meatal react with cupric sulfate, how many grams of copper metal will be created. How do I write this problem out and solve it
November 30, 2010 by Tosha

Chemistry
How much calcium chloride would you need to dissolve in 500 grams of water to create a solution whose boiling point is 100.40 C?
December 6, 2010 by anaymous

chemistry
if i dissolve 176 grams of ionic compound (particles=3) in 750 got H2O and freezing point to -8.3 degrees Celsius what is the molar mass
May 10, 2011 by chelsea

Analytical Chemistry
Calculate the number of grams needed to be dissolved and diluted to 100 ml to prepare 0.200M solution for the following substance BaCrO4. huh?
October 16, 2011 by Stumped

chemistry
What mass (in grams) of potassium acetate, KC2H3O2, must be added to 140 mL of 0.010 M acetic acid to form a buffer solution with a pH of 4.5? (Ka (HC2H3O2)= 1.8 x 10-5)
March 5, 2012 by Anonymous

physical science
(a) If a person wearing such a mask exhales 0.702 g CO2 per minute, How many grams of KO2 are consumed in ten minutes?
March 13, 2012 by brandi

CHemistry Question (pv=nrt)
How many liters of chlorine gas at 1.00 atm and 20ºC will be required to oxidize 167 grams of bromide ions to molecular bromine? A. 13.5 L B. 25.1 L C. 101 L D. 1.72 L E. 50.3 L
April 5, 2012 by M

chemistry
Write the equation for the decomposition of HI, knowing that the reaction requires 9.4 kj/mol of hydrogen forming. If 100.0 kj of energy are added, how many grams of iodine will form.
May 6, 2012 by Bob

Ap Chem
how many milliliters of a 0.9 molar HCl solution are needed to react completely with 12 grams of zinc according to the following equation 2HCl+ Zn yields ZnCl2+ H2
September 10, 2012 by Chasm

Phamacy math
One teaspoonful diluted to a quart results in a 1/5000 solution. What is the amount of potassium permanganate in grams required to fill this prescription?
September 21, 2012 by Nick

chemistry
To what temperature, in degree celsius, must 10.0 grams of ammonia gas (NH3) have to be heated in a 15.0 L container in order for it to exert a pressure of 3.50 atm?
February 13, 2013 by Abbie

Chemistry
What is the molarity of a salt solution that is made from 31.0 grams of Ca3(P04)2 placed in a volumetric flask and filled to the 2 liter line with distilled water?
March 18, 2013 by Matt M

math grade 8 please help!!!
1/5 of 10% of 200g how would i solve this plz explain!! (one over five of ten percent of two-hundred grams)
November 23, 2013 by anonymous

chemistry
What is the total energy change if 150.0 grams of ice at 0.0 oC are melted, then the water is warmed to 45.0 oC? Is this process endothermic or exothermic? ƒ´Hf = 6.01 kJ/mol(multiple steps)
March 6, 2014 by evelyn

ßíãíÇÁ
q// calculate the concentration of Potassium ion in grams per liter after mixing 100mL of 0.250M KCL and 200 mL OF 0.100 M k2SO4?
June 5, 2014 by Ahmed

physics
Clint Dempsey takes a free kick and kicks a soccer ball with a mass of 440 grams at 98 miles per hour. what is the momentum
September 7, 2014 by joe

Chemistry
A current of 4.00 A is passed through a solution of AgNO3 for 1.00 hr. What mass of silver is deposited at the cathode? (In grams) Use Faraday's constant F = 9.65x10^4 C/mol
January 11, 2015 by Jon

French
Can you please check these thanks. Directions: Identify each person described below (we are in the sports chapter by the way) Part 1 1. Un garçon ou une fille qui joue -------------. Answer: un joueur ou une joueuse 2. Un joueur qui garde le but --------------. Answer: le ...
October 1, 2009 by Missy

VOCABS
Synonyms: most nearly means the same 1. consequence A. result B. problem C. lie D. arrangement Answer: a 2. dole a. demand b. examine c. grieve d. allot Answer: d 3. indisputable a. unforced b. unhappy c. unarguable d. unimaginative Answer: c 4. Panorama a. circle b. stadium c...
March 7, 2015 by Anonymous

Physics/ Chemistry please help
The active ingredient in the allergy medication Claritin contains carbon (C), hydrogen (H), chlorine (Cl), nitrogen (N), and oxygen (O). Its molecular formula is C22H23ClN2O2. The standard adult dosage utilizes 1.480 1019 molecules of this species. Determine the mass (in grams...
April 14, 2007 by Mary

science
how do i calculate the mols of sulfuric acid ? mols = grams/molar mass
February 7, 2007 by Deon

Chemistry
Calculate the amount (in grams) of AgNO3 needed to prepare 250.0 mL of 0.25 M of AgNO3.
March 9, 2008 by Allie

chemistry
2 Mg(s) + O2(g)= 2 MgO(s) ÄH= -1204 kJ How many grams of MgO are produced during an enthalpy change of 96.0 kJ?
October 2, 2009 by Vanessa

chemistry
how many grams of CaCl2 would be dissolved in 1.9 liters of a 0.2 molarity solution of CaCl2?
January 13, 2010 by q

chemistry
if you start with 5.5grams of magnesium chloride,how many grams of magnesium flouride will be produced?
February 24, 2010 by amber

science
How many grams of CuSO4 .5H2O are needed to prepare 50 ml of 0.30M CuSO4 solution
March 7, 2010 by kesiha

Chemistry
How many grams of K2SO4 would you need to prepare 1500 g of 5.0% K2SO4 (m/m) solution?
April 26, 2010 by Jack

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