W(X) = 100%*m(X)/m, m = p*V => m(X) = w(X)*p*V/100%
m(X) = 10%*1,2*20/100% = 2,4 г
Ответ: 2,4 г
H2C=CH-CH(CH3)-C6H13+H2O----->
------->H3C-CH(OH)-CH(CH3)-C6H13
Ω (NaCl)=(50 г/250 г)*100\%=20\%
Na2S + ZnSO4 --> ZnS + Na2SO4
7.8g 20g x
0.1mol 0.124mol
m(Na2S)=78*0.1=7.8g n(Na2S)=7.8/78=0.1mol
m(ZnSO4)=200*0.1=20g n(ZnSO4)=20/161=0.124 mol
m(ZnS)=0.1*97=9.7 g