Use of amount of substance in relation to masses of pure substances

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Question 20
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In the industrial production of nitric acid via the Ostwald process, ammonia (NH3\text{NH}_3NH3​) is oxidised over a platinum-rhodium catalyst according to the equation:

4NH3+5O2→4NO+6H2O4\text{NH}_3 + 5\text{O}_2 \rightarrow 4\text{NO} + 6\text{H}_2\text{O}4NH3​+5O2​→4NO+6H2​O

Calculate the volume of oxygen gas (O2\text{O}_2O2​) needed to react completely with 6.8 kg6.8\text{ kg}6.8 kg of ammonia.

(Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1, N=14\text{N} = 14N=14; the volume of one mole of gas is 24 dm324\text{ dm}^324 dm3.)

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Use of amount of substance in relation to masses of pure substances Questions

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