<span>Fe+<span>CuCl2</span> → Cu+<span>FeCl2 ( А - 1)
</span></span><span><span>2<span>FeCl3</span></span>+Cu → <span>CuCl2</span>+<span>2<span>FeCl2 (Б - 2)
</span></span></span><span>Fe+<span>2<span>HCl</span></span> → <span>FeCl2</span>+<span>H2 (В - 3)
</span></span><span><span>Fe</span>+<span>3<span>Cl</span></span> → <span>FeCl<span>3 (Г - 4)</span></span></span>
Ответ:
дано :
m (H2O) = 18г
найти:
m(H2) -?
решение:
H2 + 2O2 = 2H2O
n= m/M
n(H2O) = 18г /16+2 г/моль = 1 моль
x/1 = 1/2
x =1/2 = 0.5 моль
n(H2) = 0.5моль
m(H2) = n(H2) * M(H2) = 0.5 моль * 2 г/моль = 1 г
Ответ: m(H2) = 1г