For the reaction H 2 (g) + 1/2O 2 (g) → H 2 O(l), assume Δ E = -270 kJ per mole of H 2 and that the energy is released only due to a decrease in mass of the system (c = 3 × 10 8 m/s). The theoretical

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For the reaction H 2 (g) + 1/2O 2 (g) → H 2 O(l), assume Δ E = -270 kJ per mole of H 2 and that the energy is released only due to a decrease in mass of the system (c = 3 × 10 8 m/s). The theoretical decrease in mass on combustion of 6.0 g of hydrogen is

TestHub · Accepted Answer

6.0 g of H 2 = 3.0 mol. Energy = 3 × 270 kJ = 8.1 × 10 5 J. Δ m = E/c 2 = 8.1 × 10 5 /9 × 10 16 = 9.0 × 10 -12 kg (which is 9.0 × 10 -9 g, so option (b) has the wrong unit). This is option (d).

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