According to the equation, N2(g)+3H2(g)⇌2NH3(g) at constant temperature and pressure, 40% of mixture of 0.2 mol of N2 and 0.6 mol of H2 react to give NH3. Then the ratio of the final volume to the initial volume of gases is:
A
4 : 5
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B
5 : 4
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C
5 : 3
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D
8 : 5
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