Дано
V(NH3)= 5.6 L
m(ppa HBr)= 200 g
W(HBr) = 12.15%
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m(NH4Br)-?
m(HBr) = 200*12.15% / 100% = 24,3 g
n(NH3)= V(NH3) / Vm = 5.6 / 22.4 = 0.25 mol
M(HBr) = 81 g/mol
n(HBr) = m/M= 24.3 / 81 = 0.3 mol
n(NH3)
NH3+HBr-->NH4Br
n(NH3) = n(NH4Br) = 0.25 mol
M(NH4Br)= 98 g/mol
m(NH4Br) = n*M= 0.25*98 = 24.5 g
ответ 24.5 г