2Na + S = Na₂S
m(S) = 12.8г
n(S) = m ÷ M = 12.8г ÷ 32 г\моль = 0.4 моль
n(S) = n(Na₂S) = 0.4 моль
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2Na + S = Na₂S
m(S) = 12.8г
n(S) = m ÷ M = 12.8г ÷ 32 г\моль = 0.4 моль
n(S) = n(Na₂S) = 0.4 моль