Question

a sample of nitrogen gas has a volume of 2.75 L at STP. how many moles of CO2 are present?

Answer 1

One mole of an ideal gas will occupy a volume of 22.4 liters at STP (Standard Temperature and Pressure, 0°C and one atmosphere pressure).

Proportion:

1 mole – 22.4 L

n moles – 2.75 L

$n = \frac{1 \times 2.75}{22.4} = 0.122 \;mol$

Answer: 0.122 mol