Molar Volume of Gases — Prelims Questions

What is the volume occupied by $0.5\,\text{mol}$ of $\text{CO}_2$ gas at old STP?

A sample of gas occupies $44.8\,\text{L}$ at old STP. How many moles of gas are present in the sample?

Which of the following statements about molar volume is INCORRECT?

What is the molar volume of an ideal gas at $27^\circ\text{C}$ and $2\,\text{atm}$ pressure? (Given $R = 0.0821\,\text{L} \cdot \text{atm} \cdot \text{mol}^{-1} \cdot \text{K}^{-1}$)

A reaction produces $5.6\,\text{L}$ of $\text{N}_2$ gas at old STP. What is the mass of $\text{N}_2$ produced? (Molar mass of $\text{N}_2 = 28\,\text{g/mol}$)

If $10\,\text{L}$ of $\text{H}_2$ gas reacts completely with $5\,\text{L}$ of $\text{O}_2$ gas to form water vapor, what volume of water vapor is produced at the same temperature and pressure? (Assume ideal gas behavior)