дано
m(K) = 7.8 g
η(H2) = 70%
------------------
Vпракт (H2)-?
2K+HOH-->2KOH+H2
M(K) = 39 g/mol
n(K) = m(K) / M(K) = 7.8 / 39 =0.2 mol
2n(K) = n(H2)
n(H2) = 0.2 / 2 = 0.1 mol
Vтеор(H2) = n(H2) * Vm = 0.1*22.4 = 2.24 L
Vпракт (H2) = V(H2)*η(H2) / 100% = 2.24 * 70% / 100% = 1.568L
ответ 1.568 л
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дано
m(K) = 7.8 g
η(H2) = 70%
------------------
Vпракт (H2)-?
2K+HOH-->2KOH+H2
M(K) = 39 g/mol
n(K) = m(K) / M(K) = 7.8 / 39 =0.2 mol
2n(K) = n(H2)
n(H2) = 0.2 / 2 = 0.1 mol
Vтеор(H2) = n(H2) * Vm = 0.1*22.4 = 2.24 L
Vпракт (H2) = V(H2)*η(H2) / 100% = 2.24 * 70% / 100% = 1.568L
ответ 1.568 л