<span>а) 2PbS+ 3O</span>₂<span> → 2PbO + 2SO</span>₂<span> ↑
б) Сr</span>₂<span>O</span>₃<span> + 2Al → Al</span>₂<span>O</span>₃<span> + 2Cr
в) Fe</span>₂<span>O</span>₃<span> + Na</span>₂<span>CO</span>₃<span> → 2Na</span>Fe<span>O</span>₂<span>+ CO</span>₂<span> ↑</span>
1)
C3H8 ---(Ni,t)---> C3H6 + H2
n(H2) = 11,2 л / 22,4 л / моль = 0,5 моль
n(H2) = n(C3H8) = 0,5 моль
V(C3H8) = 0,5 моль * 22,4 л / моль = 11,2 л
3)
n(C2H2) = 15 л / 22,4 л / моль = 0,67 моль
n(H2) = 0,67 моль * 2 = 1,34 моль
V(H2) = 1,34 моль * 22,4 л / моль = 30 л