Ответы на вопрос:
mr(h3po4) = 98
w(h) = ar(h) * n / mr(h3po4) * 100% = 1 *3 / 98 *100% = 3%
w(p) = ar(p) * n / mr(h3po4) * 100% = 31 / 98*100% =31,6%
w(o) = ar(o) * n / mr(h3po4) * 100% = 16*4 / 98 * 100% = 65,3%
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