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May 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: 59,652

chemistry
the heat of this reaction,Na + 1/2 Cl 2 NaCl, is 98.3 kcal/mole what is the heat given off two moles of NaCl are formed ?
October 21, 2010 by u wish

Physics
If a balloon is filled with helium gas of molar mass 4x10^-3, at a pressure of 1*10^5, What is the number of moles of gas in the balloon?
October 27, 2010 by George

Science HELP!
If a balloon is filled with helium gas of molar mass 4x10^-3, at a pressure of 1*10^5, What is the number of moles of gas in the balloon?
October 27, 2010 by George

Chemistry
How many moles of water are in 1.0g of water? (Give number only in space below to the correct number of significant figures)
March 4, 2012 by Ashley

chemistry
How many moles of vanadium atoms, V, are needed to combine with 0.725 mol of O atoms to make vanadium pentoxide,V2O5?
November 25, 2012 by Dom

Chemistry
The differnece in the mass of 100 moles of each sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
December 15, 2012 by Mohit

Chemistry
A helium balloon contains 0.54g of helium. Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?
February 22, 2013 by Mira

Chemistry
Which is the more concentrated solution: a solution made with .70 moles of NaCl in a .35L water or a 35g of NaCl in .75L?
April 8, 2013 by Alexis

Chemistry
A sample of argon gas at STP occupies 56.2 liters. Find the number of moles of argon and the mass in the sample
April 27, 2013 by Emily

chemistry
A helium balloon contains 0.30g of helium. Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?
September 24, 2014 by bob

chemistry/math
5.0 moles of solid sodium chloride (NaCl) are used to prepare a 5.0 M NaCl solution. What is the volume of the solution?
October 13, 2014 by Morgan

Chemistry again
Two voltaic cells are to be joined so that one will run the other as an electrolytic cell. In the first cell, one half-cell has Au foil in 1.00M Au(NO3)3, and the other half-cell has a Cr bar in 1.00M Cr(NO3)3. In the second cell, one half-cell has a Co bar in 1.00M Co(NO3)2, ...
May 4, 2008 by stumped

Chem
I am having problems with these two questions. 1.The value of the equilibrium constant (Kp) as represented by the first chemical equation is 1.58 x 102 at 727 °C. Calculate the value of the equilibrium constant (Kp) for the second equation at the same temperature. Express ...
January 22, 2009 by Mark

accounting for investments
Can someone check my answers. -For each of the following eight situations, select the best answer concerning accounting for investments: (A.) Increase the investment account. (B.) Decrease the investment account. (C.) Increase dividend revenue. (D.) No adjustment necessary. 1...
March 4, 2007 by stumped

science
1.   Use the diagram to answer question 1. description: particles have enough energy to break free from each other and can move around freely; particles spread out in different directions  sketch: What kind of substance is described?  (1 point) solid liquid gas molecule 2.   ...
March 31, 2014 by Kiera Lisople

Chemistry
on heating the hydrate CaSO4*2H2O, how many moles of water should be driven off per mole of hydrate? 1 mole?
November 8, 2009 by c

chemistry
a sample of unknown gas is found to have a volume of 479 mL at 27.0 degrees C and 1.30 atm. How may moles of gas are int eh sample?
November 19, 2010 by Jazz

Chemistry
methanol and aluminum are reacted. how many moles of methanol must burn to raise the temperature of 100g of aluminum by 80 degrees Celsius?
January 13, 2011 by Ashlee

Chemistry
If you have constant volume of gas how can you determine the number of moles it has? what equation do you use if your not given the constant volume value?
March 29, 2011 by Sarah

physics
How many mL of orange juice would be required to get the recommended daily allowance of 60 mg of vitamin C? (Concentration of vitamin C is .011 moles/L in 5.0 mL of juice).
May 4, 2011 by Seth

physics
2 moles of an ideal gas at 20k changes from a pressure of 15 atm to 3 atm at constant temperature. Calculate the work done by the gas.
March 21, 2012 by frank fred

Chemistry
Consider the reaction CH4+ 2Cl2=CCl4. If .33 moles of CH4 is reacted with 1 mole of Cl2, how much CCl4 is produced?
April 12, 2012 by Lacey

Chemistry
making 2 moles of No in a reaction requires 180KJ of energy. How much No will be made if this same reaction absorbel 950KJ OF ENERGY
October 7, 2012 by Janice Madeux

chemistry
Porassium alum is 3.9 parts per 100 parts of water. Knowing this, how many moles of potassium alum are present in 50ml?
October 19, 2012 by Lex

Chemistry
How many milliliters of a 0.20 M of glucose (C6H12O6) solution are needed to provide a total of 25.0 g. of glucose? Molarity(M)= Moles of Solute/Liters of Solution
November 11, 2012 by Melia

Chemistry
How many moles of Br2 are present in 500mL of vapor when Br2(l) and Br2(g) are in equilibrium at 33 degrees celcius? (Pvap Br2 at 33C = 299 mm Hg)
December 7, 2012 by Jason

GEN CHEM
A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?
March 3, 2013 by KRIS

Chemistry
A substance releases 496kJ of heat as 2.60 moles condense from a gas into a liquid. What is the molar heat of vaporization of the substance?
May 7, 2013 by Anonymous

chemistry
a sample of oxygen gas has a volume of 7.64 L at a temperature of 19C and a pressure of 1.38 atm. Calculate the moles of O2 present in this gas sample
May 8, 2013 by barbra

Chemistry
A compound with a percent composition by mass of 87.5% N and 12.5% H was recently discovered. What is the number of moles of Hydrogen in this compound? Atomic Mass: N = 14.01, H = 1.008
August 1, 2013 by Anonymous

chemistry
you wish to calculate the mass of hydrogen gas that can be prepared from 4.89 g of SrH2 and 5.28 g of H2O. (a) How many moles of H2 can be produced from the given mass of SrH2?
September 20, 2013 by Anonymous

chemistry
SHOW WORK How many moles of helium occupy 26.4 L at a pressure of 103.0 kPa, and 10 degrees Celsius? A.) 0.03 mole B.) 0.86 mole C.) 1.16 mole D.) 32.72 mole
December 4, 2013 by Caitlyn

chemistry
A sample of nitrogen gas is confined in a 8.278 x 10-2 L container at 2.236 x 102 torr and 50 oC. How many moles of gas are present in the sample?
January 27, 2014 by erin

chemistry
Determine the number of moles of N atoms in a sample of C7H5(NO2)3 that has the same number of O atoms as 12.6g C6H12O6
September 20, 2008 by tomi

chemistry
A dilute sulfuric acid solution that is 3.39 molality H2SO4 has a density of 1.18 g/mL. How many moles of H2SO4 are there in 375 mL of this solution?
February 23, 2010 by Nick

chemistry
how many moles of solute are contained in each solution? 250 mL of a 0.55 M NaNO3 solution? 145 mL of a 4.0 M HNO3 solution? 6.5 L of a 2.5 M HCl solution?
April 11, 2010 by cathy

chemistry
A stock solution is prepared by adding 26 mL of 1.1 M K3PO4 to enough water to make 30 mL. How many moles of K+ are in 21 mL of the stock solution?
November 4, 2010 by Ashley

chemistry
A sample containing .187 g cl is dissolved in 50.0 mL water. How many moles of cl ion are in the solution? what is the molarity of the cl ion in the solution?
March 1, 2011 by kristen

Chemistry
1.What is the molarity of a solution of silver perchlorate, AgClO 4, if 3.2 moles of silver perchlorate are dissolved in 1.5 liters of water?
April 6, 2011 by Barbara

Chemistry
1.What is the molarity of a solution of silver perchlorate, AgClO 4, if 3.2 moles of silver perchlorate are dissolved in 1.5 liters of water?
April 6, 2011 by Barbara

Chemistry
Calculate the number of moles in 22.6 g C3H7OH 22.6g C3H7OH x 1 moL C3H7OH /60.11g C3H7OH = 0.375 molC3H7OH Am I right
September 30, 2011 by Monique

chemistry
how many moles of CO2 are produced if you start with 3 mol of CaCO3? balanced equation is: CaCO3--->CaO=CO2
October 5, 2011 by bethany

chemistry
balnced equation CaCO3-->CaO+CO2 how many moles of CO2 are produced if you start with 3 mol of CaCO3?
October 5, 2011 by bethany

Chemistry
If 0.274 moles of a substance weighs 62.5g, what is the molar mass of the substance? 62.5/0.274 = 228.1 Am I on the right track?
October 25, 2011 by Izzie

chemistry
287 mL of a 2.93 m solution of sodium bicarbonate reacts with iron (II) phosphate. How many moles of iron (II) bicarbonate are formed?
March 5, 2012 by Victoria

chemistry
287 mL of a 2.93 m solution of sodium bicarbonate reacts with iron (II) phosphate. How many moles of iron (II) bicarbonate are formed?
March 5, 2012 by Victoria

chem
How many moles of C6H12O6 are formed when 0.250 mole of CO2 is consumed in the reaction 6 CO2 + 6 H2O C6H12O6 + 6 O2?
June 20, 2012 by joe

Chem 1252
Calculate the heat in Joules when 24.48 moles of H2O(l) are cooled from 55.0 degrees Celsius to 25.5 degrees Celsius.
September 12, 2012 by Anonymous

Chemistry
Using the balanced equation of: HCl+NaOH-->H20+NaCl, how many moles of HCl could be neutralized with 13.2 mL of 3.00 M NaOH?
February 26, 2013 by Alicia

chemistry
An aqueous solvent of NaCl has a melting point of –165C How many moles of NaCl are present in a 189 g solvent?
March 4, 2013 by breseida

chemistry
A gas is stored in a 3.5L container at 15 degrees celsius and 655mmHg. Calculate the number of moles of the gas in the container
April 30, 2013 by Anonymous

chemistry
A gas is stored in a 3.5L container at 15 degrees celsius and 655mmHg. Calculate the number of moles of the gas in the container
April 30, 2013 by Anonymous

Chemistry ?
How many moles are contained in a 4.67-L sample of gas at 30°C and 199 kPa? A. 1.7 mol B. 11.8 mol C. 0.37 mol D. 3.7 mol I guessed D, but I'm not sure.
August 15, 2013 by Kaylee

Chemistry
A helium ballon contains 0.32g of helium. Given the molecular weight of helium is 4. How many moles of helium does it contain.
March 31, 2014 by Anonymous

Math Solve the following
Question: 1.Russell has a pipe that is 150 inches long. it must be cut into 3 1/8 inches segments for project. How many segments will he have? 2. Rebeckah is an elementary school teacher. she is making an individual craft project kits that requires 2/3 of a cup of water to ...
October 31, 2012 by jessica

Chem HELP!!!!!!!
To 0.350L of 0.150M NH3 is added 0.150L of 0.100M MgCl2. How many grams of (NH4)2So4 should be present to prevent precipitation of Mg(0H)2(s)?
April 18, 2009 by Angel

Chemistry
For the reaction shown, compute the theoretical yield of the product in grams for each of the following initial amounts of reactancts 2Al(s) + 3Cl2(g) = 2AlCl3(s)
July 12, 2009 by Tanya

Chemistry
What volume in mL of .100 M NaOH would be required to titrate a 297 mg sample of a weak acid with an equivalent weight of 126 grams?
November 30, 2009 by Telly

chemistry
How many grams of CO2 are contained in 550 mL of the gas at STP I've worked all of these questions and I'm trying to see if I'm right, and if not, where I went wrong.
October 19, 2010 by lavonne

Chemistry 1
What is the minimum amount of a 6.0 M solution of sulfuric acid necessary to produce 25 grams of hydrogen gas if the molar ratio in the chemical reaction is a 1:1
October 21, 2010 by Jordan

chemistry
How many liters of carbon dioxide gas will be produced from the decompostion of 5.0 grams of sodium hydrogen carbonate? How do I write out equation and solve it
November 30, 2010 by Tosha

Chemistry
How many grams of sodium carbonate must be added to 2.50 kg of water in order to lower the freezing point of the resulting solution to 258 Kelvin?
December 6, 2010 by sfs

Chemistry
If you have Hydrochloric acid, how many grams of aluminum must you use to produce 57.0 L of hydrogen at STP? 2Al(s)+6HCl(aq) --> 3H2(g)+2AlCl3(aq)
December 8, 2010 by Brittany

chemistry
one gram of magensium is burnt in a closed vessel which contains 0.5 grams of oxygen. which is limiting reactant? what is the amount of mgo formed ?
August 26, 2011 by Khushi

Chemistry
How many milliters of 1.80M HCl are required to react with 30.0 grams of calcium hydroxide according to the given equation: CA(OH)2(s) + 2HCl(aq)> CaCl2(aq) + 2H2O(l)
April 3, 2011 by Elaine

Chemisty
How many grams of sodium bicarbonate mut be decomposed by: HCl (ag) + NaHCO3 (ag) ----> NaCl (ag) + CO2 (g) + H2O (l) to yield 75.0 mL of carbon dioxide at STP?
April 23, 2011 by Adele

chemistry
using this equation: Ni+H2SO4=H2+NiSO4 how many liters of hydrogen gas at 298degK and 2.5atm could be produced if you react 25 grams of nickel metal?
April 25, 2011 by chemdumby

Chemistry
Use the Ideal Gas Law to determine the volume of CO2 produced at 25oC 1.5 atm of pressure from the combustion of 35 grams of C6H10.
May 7, 2011 by Bimpe

chemistry
How many grams of oxygen gas can be produced when 4.50 L of NO2 react according to the equation below at 427 ¨¬C and 1.15 atm? 4NO2(g) + 6H2O(g) ¡æ 7 O2(g) + 4NH3(g)
June 9, 2011 by katydid

Chemistry
To 0.360 L of 0.140 M NH3 is added 0.150 L of 0.100 M MgOH2. How many grams of (NH4)2SO4 should be present to prevent precipitation of Mg(OH)2 (s)? THANK YOU!!!
June 23, 2011 by Lilly

chemistry
How many grams of Na2CO3 are required to completely react with 35.6mL of a 0.315M HCl solution? Na2O3(s) + 2HCl(aq) --> 2NaCl(aq( + CO2(g) + H2O(I)
July 2, 2011 by ashley

chemistry
How many grams of Na2CO3 are required to completely react with 35.6mL of a 0.315M HCl solution? Na2O3(s) + 2HCl(aq) --> 2NaCl(aq( + CO2(g) + H2O(I)
July 2, 2011 by ashley

Chemistry
Consider the reaction below : P4(s) + 5O2(g) ---> P4O10(s) How many grams of phosphorus react with 4.745 x 10^1 L of oxygen at STP to form tetraphosphorus decaoxide?
July 29, 2011 by Brooke

chemistry
Please help again. How many grams of lithium are required to completely react with 70.7 mL of N2 gas at STP when given the following reaction: 6Li + N2 = 2Li3N
December 3, 2011 by Lisa

Chemistry
How many grams of nickel (II) chloride must be added to 1.50 L of a 0.500 M sodium sulfide solution to precipitate out all of the product of interest?
February 21, 2012 by Bella

CHemistry Question
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

Chem 2 Lab
Calculate the volume of a 0.150 M NaOH solution that will be required to neutralize all of the H+ ions in 0.400 grams of phosphoric acid?
April 25, 2012 by Lacey

chemistry
how many liters of hydrogen gas can be formed at 722 mmHg at 15 degress C when 5.5 grams of zinc metal with 150 mL of 1.25 molarity HCl solution?
November 10, 2012 by Missy

Chemistry
Solve the following pls. Calculate the number of grams in these quantities: 1. 0.0600 mol HC2H302 2. 4.50 x10^21 molecules glucose C6H2O6
December 14, 2012 by sally

chemistry
what mass of water is expected when 5.80 grams of sodium carbonate reacts with excess sulfuric acid? what volume of gas is produced at STP?
January 24, 2013 by jessica

chemistry
what mass of water is expected when 5.80 grams of sodium carbonate reacts with excess sulfuric acid? what volume of gas is produced at STP?
January 24, 2013 by jessica

chemistry
How many grams of Mg(OH)2 are needed to neutralize 55 ml of 0.25 M HCl . according to the following reaction. (show all calculations for credit) Mg(OH)2 (aq) + 2HCl(aq) --- MgCl2 (aq) + 2H2O(l)
March 20, 2013 by Cory

chemistry
if you want a solution that is .1m in ions what mass of na2so4 must you dissolve in125 grams of water assume total dissolution of ionic solid.
March 23, 2013 by rich

ap chemistry
We drop 50.5 grams of magnesium into 572 mL of a 3 M HCl solution. What is the maximum volume of dry hydrogen that could be produced by this reaction at STP?
April 28, 2013 by Anonymous

Chemistry
If 20 grams of sulfur reacts with an excess of oxygen, what volume of the product SO2 would be collected at 108.5 kPa and 15 degrees Celseius?
April 30, 2013 by Christina

chemistry calculation
I need to know what volume of liquid phosphoric acid at 85%, H3PO4 with density of 1.685 will replace 5 grams of powdered NaH2PO4. H2O. thanks
June 1, 2013 by sue

chemistry
You have 120 grams of U-235. How many half lives would it take to make enough helium to fill a 5.60 L balloon at STP?
July 3, 2013 by Mary

Math, science
assume the substance has a half-life of 12 years and the initial amount is 133 grams. How long will it be until only 40 % remains?
September 10, 2013 by Sam

AP Chemistry
We drop 17.3 grams of magnesium into 435 mL of a 2 M HCl solution. What is the maximum volume of dry hydrogen that could be produced by this reaction at STP?
October 15, 2013 by Anonymous

Chemistry
determine the amount of water formed in 4NH3 + 5O2 4NO + 6H2O if 10 g of Oxygen is mixed with 10g nitrigen trihydride in grams
February 21, 2014 by Lee Walkr

chem
18.1g of ammonia and 90.4g of copper(II) oxide are used in the reaction 2NH3+3CuO=N2+3Cu+3H3O.What is the limiting reactant? How many grams of nitrogen will be formed?
March 18, 2014 by fredrick

Chemistry
What volume in liters will be required to dissolve 60.9 grams of Mg(OH)2? Ksp = 1.8×10-11 After doing the math, i got 1.58e-4, but its not right, so i have no idea what to do now.
March 25, 2014 by Brianna

chemistry
If i have 12 grams of potassium chlorate dissolved in 100g of water at 65 celsius how much would i need to make the solution saturated
June 16, 2014 by adri

chemistry
What weight of lead nitrate in grams would need to be dissolved in 400 mL of water to prepare a 270 ppm solution of Pb2+?
October 12, 2014 by niks

chemistry
Calculate the weight in grams of potassium hydrogen phthalate (KHP, KHC2H3O2, MW 202.2 g/mole) required to neutralize 25.00 ml of 0.1 M NaOH solution.
April 15, 2015 by ryan

Precalcus
Suppose that 10 grams of carbon ( 14C )is released in a nuclear energy plant accident. How long will it take for the 10 gramto decay to 1 gram?
April 25, 2015 by Keem Graham

chemistry
I tried using the answer you provided but the online system I am using is not taking this as a correct answer. This is the answer you provided: AgCl(s) + H2O(l) ==> Ag^+(aq) + Cl^-(aq). PLEASE HELP!! Thanks My original question: Write the equation for the dissolution of ...
March 12, 2011 by gin

Chem
A household bleach solution contains 5.25% (by mass) NaClO. How many moles of NaClO are needed to make 1000L of the solution? (density = 1.07g/mL)
March 26, 2010 by Staci

chemistry!
An ideal gas has a volume of 3.0 L. If the number of moles of gas and the temperature are doubled, while the pressure remains constant, what is the new volume?
May 4, 2010 by jenny

College Chemistry
The Cu2+ ions in this experiment are produced by the reaction of 1.0 g copper turnings with excess nitric acid. How many moles of Cu2+ are produced?
October 7, 2010 by Maggie

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