Question

The perfect gas equation for 4 gram of hydrogen gas is
(a) PV = RT (b) PV = 2RT
(c) PV= 1/2RT (d) PV = 4RT

Answer 1

Answer:

option b is the correct one.

Explanation:

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Ideal gas equation is given by,

PV=nRT

where,

• p=pressure
• v=volume
• R=real gas constant
• T=temperature
• n=no.of moles

no.of moles is given by,

$n = \frac{given \: mass}{molar \: mass}$

• given mass=4g
• molar mass of H2 gas=2g

(hydrogen is bimolecular,hence, 2×1g=2g)

therefore,

$n = \frac{4}{2} \\ = 2$

and, hence,

PV=2RT

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Answer 2

Answer:

Number of moles of a substance=Total weight of substance/Molecular weight of substance

⟹n=W/M0

=4/2mol

=2mol

Hence the Ideal Gas equation becomes PV=nRT

⟹PV=2RT