Ответы на вопрос:
mr(h2sio3) = 1*2 + 28 + 16*3 =78
w(h) = ar(h) *n(h) / mr(h2sio3) *100% = 1*2 / 78 *100% =2,5%
w(si) = ar(si) *n / mr(h2sio3) *100% = 28 *1 / 78 *100% =36%
w(o) = ar(o) *n / mr(h2sio3) *100% = 16*3 / 78 *100% =61,5%
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