РЕШИТЕ ЭТОТ ТЕСТ ОЧЕНЬ НАДО

1) 
дано
m(H2SO4) = 4 g
m(Zn) = 2.6 g
V(практ H2) = 0.7 L

φ-?
M(H2SO4) = 98 g/mol 
n(H2SO4) = m/M= 4/ 98 =0.0408 mol
M(Zn)= 65 g/mol
n(Zn) = m/M = 2.6 / 65 = 0.0400 mol

n(H2SO4) > n(Zn)

Zn+H2SO4 -->ZnSO4+H2
n(Zn) = n(H2) = 0.04 mol
V(H2) = n(H2) * Vm = 0.04*22.4 = 0.896 L

φ = V(практ) / V(теор) * 100% = 0.7 / 0.896 * 100% = 78.13%

ответ 78.13%

2)
дано
m(CO2) = 0.88 g
m(ppaNaOH) = 10 g
W(NaOH)= 30%

m(Na2CO3)-?

m(ppa NaOH)= 10*30%/100% = 3 g
M(NaOH) = 40 g/mol
n(NaOH) = m/M = 3/40 = 0.075 mol
M(CO2) = 44 g/mol
n(CO2) = m/M = 0.88 / 44 = 0.02 mol
n(NaOH) > n(CO2)

2NaOH+CO2-->Na2CO3+H2O  M(Na2CO3) = 106 g/mol
n(CO2) = n(Na2CO3) = 0.02 mol
m(Na2CO3) = n*M = 0.02 * 106 = 2.12 g
ответ 2.12 г