The increased volume of which gas in the atmosphere is affecting the Earth’s weather and climate?
Oxygen
Carbon dioxide
Hydrogen
Nitrogen
(a) What volume of oxygen is required to burn completely a mixture of 22.4 dm3 of methane and 11.2 dm3 of hydrogen into carbon dioxide and steam? Equations of the reactions are given below: CH4 + 2O2 → CO2 + 2H2O 2H2 + O2 → 2H2O (Assume that all volumes are measured at STP) (b) The gases hydrogen, oxygen, carbon dioxide, sulphur dioxide and chlorine are arranged in order of their increasing relative molecular mass. Given 8 g of each gas at STP, which gas will contain the least number of molecules and which gas the most?