C4H10 + 4O2= 4CO2+5H2O
C3H8+5O2=3CO2+4H2O
CH3-CH3+Cl2=CH3-CH2-Cl + HCL
CH3-CH2-CH2-CH2-CH3 = (-CH2-CH(CH3)-CH(CH3)-CH2-)n
Дано
m(CuO) = 40 g
----------------------------
m(CuSO4)-?
CuO+H2SO4-->CuSO4+H2O
M(CuO) = 80 g/mol
n(CuO) = m/M = 40/80 = 0.5 mol
n(CuO) = n(CuSO4) = 0.5 mol
M(CuSO4) = 160 g/mol
m(CuSO4) = n*M = 0.5*160 = 80 g
ответ 80 г
80л х г
2NO2+H2O=2HNO3+NO
-------- -----------
2 моль 2 моль
44,8 126
V(примесей)=100*0.2=20л
V(NO2)=100-20=80л
M(HNO3)=1+14+16*3=63
80/44.8=x/126
x=225 г
w=(m(в-ва)/m(р-ра))*100%
m(р-ра)=(m(в-ва)*100%)/w
m(р-ра HNO3)=(225*100%)/63=357.1 г
HCl+CH3-C=-C-CH3 = CH3-CH=CCl-CH3