A 500 c m 3 flask weighs 0.65 g more when filled with an unknown gas at 1.00 × 1 0 5 Pa and 2 7 ∘ C than when empty. Find the molecular mass of the gas in g/mol (nearest integer).

n = RT P V = 8.314 × 300 1 0 5 × 5 × 1 0 − 4 = 0.0200 mol. M = 0.0200 0.65 = 32.4 , so 32 g/mol.

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoKinetic Theory of Gases and Gas LawsMedium2 minQB

PhysicsMediuminteger

A 500 $c m^{3}$ flask weighs 0.65 g more when filled with an unknown gas at 1.00 $\times 1 0^{5}$ Pa and $2 7^{\circ}$ C than when empty. Find the molecular mass of the gas in g/mol (nearest integer).

Answer:

Solution:

$n = \frac{P V}{RT} = \frac{1 0 ^{5} \times 5 \times 1 0 ^{- 4}}{8.314 \times 300} = 0.0200$

mol. $M = \frac{0.65}{0.0200} = 32.4$ , so 32 g/mol.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Kinetic Theory of Gases and Gas Laws

⏱ 2mℹ️ Source: QB

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