Ответы на вопрос:
mr(c3h6) = 12*3 + 1*6 = 42
w(c) = ar(c) *n / mr(c3h6) *100% = 12 * 3 / 42 *100% = 86%
w(h) = ar(h) *n / mr(c3h6) *100% = 1 * 6 / 42 *100% = 14%
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