Ответ:

дано

m(H3PO4) = 29.6 g

m(KOH) = 22.4 g

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m(К3PO4) - ?

H3PO4+3KOH-->K3PO4+3H2O

M(H3PO4) = 98 g/mol

n(H3PO4) = m/M = 29.6 / 98 = 0.3 mol

M(KOH) = 56 g/mol

n(KOH) = m/M = 22.4 / 56 = 0.4 mol

n(H3PO4) < n(KOH)

n(H3PO4) = n(K3PO4) = 0.3 mol

M(K3PO4) = 212 g/mol

m(K3PO4) = n*M = 0.3 * 212 = 63.6 g

ответ 63.6 г

Объяснение: