Предмет: Химия, автор: Pamagiitii

помогите пожайлуста решить десятое задание по химии

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Автор ответа: ktrnkrllv

20%=0,2
H2SO4+Mg—>MgSO4+H2
W=m(чистого)/m(смеси)
m(чистого)=W*m(смеси)
m(чистого)H2SO4=0,2*49г=9,8г
n(H2SO4)=m/M=9,8г/98г/моль=0,1моль
по уравнению реакции видим, что по соотношению n(H2SO4)=n(H2)=0,1моль
n=V/Vm
V(H2)=n*Vm=0,1моль*22,4л/моль=2,24л

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