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Question

11g of an ideal gas contains only atoms of C and O occupies 5.6L at NTP. Identify the gas.

A
CH4
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B
N2
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C
O2
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D
CO2
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Solution

The correct option is D CO2
NTP is commonly used as a standard condition for testing and documentation of fan capacities: NTP - normal temperature and pressure - is defined as air at 20oC (293.15K, 68oF) and 1atm (101.325kPa) density 1.204kg/m3 (0.075 pounds per cubic foot)

At NTP, P=101325Pa and V=5.6L given,so
Gas law is PV=nRT
PVRT=101325×5.6×0.0018.314×293.15=0.230.25

mM=0.23
M=m0.23=11/0.23=45g
CO2 has mol wt. 44.
So D is correct answer.

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