Homework Help: College chemistry

Posted by Paula on Tuesday, March 30, 2010 at 2:47pm.

103.5 mL of hydrogen are collected over water at 22.2 degrees Celsius and 758.2 torr from reaction with 0.1356 grams of alloy. calculate the number of moles of dry hydrogen gas that were collected.

College chemistry - DrBob222, Tuesday, March 30, 2010 at 5:30pm
Use PV = nRT
P dry H2 = 758.2 torr - x torr water vapor. You will need to look up the vapor pressure of water at 22.2 C. Next, convert pressure in torr to atm by dividing torr by 760.

Don't forget to change V to liters and T to Kelvin. Calculate n, number of moles dry hydrogen.
College chemistry - Christina, Thursday, October 20, 2011 at 4:50am
I got
0.997atm(0.1035L)=n(0.0821)(295.35k)

n=0.0043 mol of H2

How would you calculate N H2, the number of moles of hydrogen gas per gram of alloy?
College chemistry - Christina, Thursday, October 20, 2011 at 4:55am
never mind. I think I got it. Do we just convert that to grams of H2 then divide it by the grams of alloy from the reaction?
College chemistry - Christina, Thursday, October 20, 2011 at 4:59am
never mind. I think I got it. Do we just convert that to grams of H2 then divide it by the grams of alloy from the reaction?
College chemistry - ELLOW, Tuesday, November 29, 2011 at 6:51pm
JISHKA-BOB

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