H2so4+zn=znso4+h2
С медью не
Fe+h2so4=feso4=h2
Ba+h2so4=baso4+h2
На 4 не знаю !!!!!!!!!!!!!!!!
CH3-CH2-CH-CH2-CH3
|
O-CH2-CH3
CH3 -CH2 - C(OH)(CH3) - CH2 -CH3
Дано
m(ppaKOH)=100 g
W(KOH)=14%
---------------------------
m(Cu(OH)2)-?
m(KOH)=100*14%/100%=14 g
14 X
2KOH+CuSO4-->K2SO4+Cu(OH)2
2*56 98
M(KOH)=56 g/mol
M(Cu(OH)2=98 g/mol
14 / 112 = X / 98
X=12.25 g
ответ 12.25 г