Other important addition reactions of alkenes
2 marks · EasyCalculate the mass of water needed to react completely with 7.0 g of ethene in the hydration reaction. (M_r of C2H4 = 28, M_r of H2O = 18)
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4.5 g (±0.1)
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Marking points
M1 · 1 mark · Moles of ethene correctly calculated or set up correctly.
A1 · 1 mark · Mass of water calculated as 4.5 g (allow 4.50 g or answers within 0.1g).
Worked solution
Equation:
Moles of ethene = 7.0 g / 28 = 0.25 mol
Mole ratio of ethene : water is 1:1, so need 0.25 mol water.
Mass of water needed = 0.25 × 18 = 4.5 g