A sample of dry gas is found to occupy 2.850 L at 22.0°C and .918atm. How many moles of the gas are present?

A sample of dry gas is found to occupy 2.850 L at 22.0°C and .918atm. How many moles of the gas are present?

1 Answer
Feb 28, 2018

0.108 moles of the gas are present.

Explanation:

To solve this problem, we need to use the ideal gas law:

PV=nRT

P is pressure in atmospheres, V is volume in liters, n is moles, R is the universal gas constant, and T is the temperature in Kelvins.

First, convert 2.0^oC to Kelvins by adding 273:

22.0^oC + 273 = 295K

Plug the known values into the equation and solve for n (moles).

(0.918)(2.850)=(n)(0.08206)(295)

n=((0.918)(2.850))/((0.08206)(295))=0.108 moles