4)
дано
m(H2) = 12g
η(NH3) = 90%
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m прак(NH3)= ?
H2+3N2-->2NH3
M(H2) = 2 g/mol
n(H2) = m/M = 12/2 =6 mol
n(H2) = 2n(NH3)
n(NH3) = 6*2/1 = 12 mol
M(NH3) = 17 g/mol
m теор(NH3) = n(NH3)*M(NH3) = 12 * 17 = 204 g
m практ(NH3) = m теор(NH3) * η(NH3) / 100% = 204 * 90% / 100% = 183.6 g
ответ 183.6 г
5)
дано
m(Zn) = 13 g
m(HCL) = 14.2 g
---------------------------
V(H2)-?
M(Zn) = 65 g/mol
n(Zn) = m/M = 13 / 65 = 0.2 mol
M(HCL) = 36.5 g/mol
n(HCL) = m/M = 14.2 / 36.5 = 0.39 mol
n(Zn) < n(HCL)
Zn+2HCL-->ZnCL2+H2
n(Zn) = n(H2) = 0.2 mol
V(H2) = n(H2) * Vm = 0.2 * 22.4 = 4.48 L
ответ 4.48 л