Ответ:
дано
m(ppa H2SO4) = 400 g
W(H2SO4) = 12%
m(BaCL2) = 300 g
W(BaCL2) = 15%
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m(BaSO4) - ?
m(H2SO4) = 400 *12% / 100% = 48 g
M(H2SO4) = 98 g/mol
n(H2SO4) = m/M = 48 / 98 = 0.5 mol
m(BaCL2) = 300*15% / 100% = 45 g
M(BaCL2) = 208 g/mol
n(BaCL2) = m/M = 45 / 208 = 0,22 mol
n(H2SO4) > n(BaCL2)
H2SO4+BaCL2-->2HCL+BaSO4
n(BaCL2) = n(BaSO4) = 0.22 mol
M(BaSO4) = 233 g/mol
m(BaSO4) = n*M = 0.22 * 233 = 51.26 g
ответ 51.26 г
Объяснение: