Two moles of nitrogen gas are contained in an enclosed cylinder with a movable piston.If the molecular mass of nitrogen is 28,how many grams of nitrogen are present?
A) 0.14
B) 56
C) 42
D) 112

Question

Quizplus · Accepted Answer

One mole of any gas at standard pressure and temperature (STP) occupies 22.4 liters. As there are two moles of nitrogen in the cylinder, the volume of nitrogen gas will be 2 x 22.4 liters = 44.8 L. To calculate the mass of nitrogen, we use the formula:

mass = number of moles x molecular mass

Therefore, mass of nitrogen = 2 moles x 28 g/mol = 56 grams. 
Therefore, the correct answer is choice B.

Two Moles of Nitrogen Gas Are Contained in an Enclosed