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Answers
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Answer:
Well, we need a stoichiometrically balanced equation to represent the combustion … and as always, we (i) balance the carbons as carbon dioxide; (ii) balance the hydrogens as water; and (iii) balance the oxygens as dioxygen gas…
H3COH(l)+32O2(g)⟶CO2(g)+2H2O(l)
And thus we get 2 equiv water per equiv methanol combusted…
nMeOH=209∙g32.04∙g∙mol−1=6.52∙mol
And so we need 32 equiv of dioxygen gas, i.e. 9.78∙mol , a mass of approx 313∙g . And we get approx 13∙mol of water … i.e. a mass of 235∙g
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