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Question

1. a What restrictions are there on the use of Gay-Lussac's law of combining volumes?
b. At the same temperature and pressure, what is the relationship between the volume of a gas and the number of molecules present?

Answer 1

1) Gay Lussac's law assumes gas behaves ideally so that equal volumes of different gases at the same pressure and temperature contain the same number of molecules. And that gases that undergo reaction do so in simple integral proportions.

ideal gas assumptions are, by the way, 1) gas molecules have no volume, 2) no intermolecular forces, and 3) collisions are elastic - ie kinetic energy is conserved....

2) given P1V1 = n1 R T1 and P2V2 = n1 R T2

if we assume P1 = P2 and T1 = T2, and R is a constant, then

P1/(R T1) = n1/ V1 and P2/(R T2) = n1/ V2

or n1/ V1 = n2 / V2

and V2 / V1 = n2 / n 1

Answer 2

(a) total volume of the two gases you combine is fixed

(b) V directly proportional to N

Answer 3

Yeah so easy a caveman can do it!!!