Question 949: Thermodynamics & KTG

Question

Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is

Accepted Answer

From PV = nRT
$${P_A} = {{{ho _A}{M_A}} \over {RT}}$$ and $${P_B} = {{{ho _B}{M_B}} \over {RT}}$$
From question,
$${{{P_A}} \over {{P_B}}} = {{{ho _A}} \over {{ho _B}}}{{{M_A}} \over {{M_B}}} = 2{{{M_A}} \over {{M_B}}} = {3 \over 2}$$
$$ 	herefore $$ $${{{M_A}} \over {{M_B}}} = {3 \over 4}$$

Answer

2

Answer

$${1 \over 2}$$

Answer

$${2 \over 3}$$

Answer

$${3 \over 4}$$

Thermodynamics & KTG

Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is

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