дано
N(H2O) = 4.62*10²⁴ молекул = 46.2*10²³
N(C12H22O11) = 0.2*10²³ молекул
m(ppa)-?
используем формулу
N = n*N(A)
n = m/M
m(H2O) = N(H2O)*M(H2O) / N(A) = 46.2*10²³ * 18 / 6.02*10²³ = 138.14 g
m(C12H22O11) = N(C12h22O11) * M(C12H22O11) / N(A)
m(C12H22O11) = 0.2*10²³*342 / 6.02*10²³=11.36 g
m(ppa) = m(H2O)+m(C12H22O11)= 138.14+11.36 = 149.5 g
ответ 149.5 г
2)
дано
m(HCL) = 7.3 g
m(KOH)-?
KOH+HCL-->KCL+H2O
M(HCL)= 36.5 g/mol
n(HCL) = m/M = 7.3/36.5 = 0.2 mol
n(HCL) = n(KOH)= 0.2 mol
M(KOH) = 56 g/mol
m(KOH) = n*M = 0.2*56 = 11.2 g
ответ 11.2 г
