Ответ:
дано
m(P) = 9.3 g
W( H3PO4) = 24.5 %
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m(ppa H3PO4)-?
4P+5O2-->2P2O5
P2O5+3H2O-->2H3PO4
M(P) = 31 g/mol
n(P) = m/M = 9.3 / 31 = 0.3 mol
n(P2O5) = 0.3*2 / 4 = 0.15 mol
n(P2O5) = 2n(H3PO4)
n(H3PO4) = 0.15 * 2 = 0.3 mol
M(H3PO4) = 98 g/mol
m(H3PO4) = n*M = 0.3 * 98 = 29.4 g
m(ppa H3PO4) = 29.4 * 100% / 24.5% = 120 g
ответ 120 г
Объяснение:
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Answers & Comments
Ответ:
дано
m(P) = 9.3 g
W( H3PO4) = 24.5 %
------------------
m(ppa H3PO4)-?
4P+5O2-->2P2O5
P2O5+3H2O-->2H3PO4
M(P) = 31 g/mol
n(P) = m/M = 9.3 / 31 = 0.3 mol
n(P2O5) = 0.3*2 / 4 = 0.15 mol
n(P2O5) = 2n(H3PO4)
n(H3PO4) = 0.15 * 2 = 0.3 mol
M(H3PO4) = 98 g/mol
m(H3PO4) = n*M = 0.3 * 98 = 29.4 g
m(ppa H3PO4) = 29.4 * 100% / 24.5% = 120 g
ответ 120 г
Объяснение: