A6.0 l sample of nitrogen gas contains 0.50 mole of a gas. if enough gas is added to make a total of 0.75 moles at the same pressure and temperature, what is the resulting total volume of the gas?

2.3 l
4.8 l
7.5 l
9.0 l

9.0 L.

Explanation:

PV = nRT.

where,

P is the pressure of the gas in (atm).

V is the volume of the gas in (L).

n is the no. of moles of the gas (mol).

R is the general constant for gases (R = 0.082 L.atm/mol.K).

T is the temperature of the gas in (K).

∴ V₁n₂ = V₂n₁.

V₁ = 6.0 L & n₁ = 0.50 mol.

V₂ = ??? L & n₂ = 0.75 mol.

∴ V₂ = (V₁n₂) / (n₁) = (6.0 L)(0.75 mol) / (0.50 mol) = 9.0 L.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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