дано
m(ppa KOH) = 300 g
W(KOH) = 20%
m(ppa H3PO4) = 300 g
W(H3PO4)= 20%
m(K3PO4)-?
m(H2O)-?
m(KOH) = m(ppa KOH) * W(KOH) / 100% = 300 * 20% / 100% = 60 g
M(KOH) = 56 g/mol
n(KOH) = m(KOH) / M(KOH) = 60 / 56 = 1.07 mol
m(H3PO4) = m(ppa H3PO4) * W(H3PO4) / 100% = 300 * 20% / 100% = 60 g
M(H3PO4) = 98 g/mol
n(H3PO4) = m(H3PO4) / M(H3PO4) = 60 / 98 = 0.61 mol
n(KOH) > n(H3PO4)
H3PO4+3KOH-->K3PO4+3H2O
n(H3PO4) = n(K3PO4) = 0.61 mol
M(K3PO4) = 212 g/mol
m(K3PO4) = n(K3PO4) * M(K3PO4) = 0.61 * 212 = 129.32 g
n(H3PO4) = 3n(H2O)
n(H2O) = 3 * 0.61 = 1.83 mol
M(H2O) = 18 g/mol
m(H2O) = n(H2O) * M(H2O) = 1.83 * 18 = 32.94 g
ответ 129.32 г , 32.94 г
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