Water can be formed from the stoichiometric reaction of hydrogen with oxygen: $2H_2(g) + O_2(g) + 2H_2O(g)$. A complete reaction of 5.0 g of $O_2$ with excess hydrogen produces how many grams of $H_2O$?

Md Ariful Islam

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Md Ariful Islam

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$2H_2(g) + O_2(g) rarr 2H_2O(g)$

We started with $(5.0*g)/(32.00*g*mol^-1)=0.156*mol" dioxygen"$.

Given excess dihydrogen, this molar quantity thus gives $2xx0.156*mol$ water.

And thus, $2xx0.156*molxx18.01*g*mol^-1~=6*g$ water are evolved. Is this reaction exothermic or endothermic?

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