Homework Help: chemistry

Posted by Lisa on Monday, December 20, 2010 at 6:50pm.

What mass of water, in grams, would have to be decomposed to produce 28.7 L of molecular oxygen at STP?

chemistry - sabeen, Monday, December 20, 2010 at 7:01pm
i think you can use stoichiometry for this question. i shud help
chemistry - TutorCat, Monday, December 20, 2010 at 8:29pm
2H2O->2H2+O2

At STP, 1 mol = 22.4L

so, convert L O2-> mol O2

then, convert mol O2-> mol H20 by mole ratio

finally, multiply by molar mass H2O

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