If 16 grams of oxygen gas and x grams of hydrogen gas occupy the same volume at the same temperature and pressure, then the value of x is:

A balloon filled with an air sample occupies a volume of 3 L at 35°C. On lowering the temperature to T at constant pressure, the volume decreases to 2.5 L. What is the temperature T?

A 10 L flask contains 6.4 g of CH 4 and 8.8 g of CO 2 at 27°C. Calculate the total pressure exerted by the mixture inside the flask. (Take R = 8.314 J mol -1 K -1 )