What is the numerical value of gas constant $R$ in terms of $\mathrm{L} \mathrm{atm} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ ?

Which of the following equations gives combined relationship of Boyle's law and Charle's law?

What is the volume occupied by 2.5 mol of ammonia gas at STP?

3.4 moles of an ideal gas occupies volume of 68 mL at 300 K . What would be the pressure of gas? $\left(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)$