Gen Chem prob yippee

[MoooShuuu]

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How would you solve these problems?

What vol of NO2 is produced from 7 g nitrogen gas @27 C and .9 ATM.
N2 + 202---> 2NO2



Another one...How many grams of Chlorine gas are needed to produce 3L of HCl gas at pressure of 2 ATM and temp of 2 HCL?


What is the molar mass of a 2 L sample of gas that weighs 8g @ temp 15C and 1.5 ATM?

 

[RUPharmStuD]

i think these are ideal gas law probs.. so use the equation PV=nRT where P is ATM,V is L, n= #of moles, R is constant (.02 i think), T is Kelvin's (273+27C)

 

[zuma35]

How would you solve these problems?

What vol of NO2 is produced from 7 g nitrogen gas @27 C and .9 ATM.
N2 + 202---> 2NO2

What is the molar mass of a 2 L sample of gas that weighs 8g @ temp 15C and 1.5 ATM?

1) 7g of N2 = .25 mol N2. 1mol N2=2mol NO2. So we have .5 moles NO2

PV=nRT
(.9)V=(.5)(.0821)(300)
V=13.7 L

2) PV=nRT
(1.5)(2)=n(.0821)(288)
n=.13 mol
MM=g/mol= 7g/.13mol= 54g/mol