When hydrogen is removed from an alkane, an alkene is formed. This is an example of a dehydrogenation reaction. 900 dm3 of propane, measured at room temperature and pressure, were dehydrogenated to form propene. Calculate the maximum mass, in kg, of hydrogen formed in this reaction. (relative atomic mass: H = 1.0; 1 mol of any gas at room temperature and pressure occupies 24 dm3 ) – 9036

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1. 1 mole of propane (C₃H₈) makes 1 mole of hydrogen gas (H₂).
   Number of moles of propane = 900 ÷ 24 = 37.5 mol
   So that’s also 37.5 moles of hydrogen.
   Mass of hydrogen = 37.5 × 2 = 75.0 g
   Convert to kg: 75.0 ÷ 1000 = 0.075 kg

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