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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: 87mustang on April 04, 2008, 07:57:40 PM

Title: what mass of H2O
Post by: 87mustang on April 04, 2008, 07:57:40 PM

what mass of H2O is formed by the complete conversion of 32.00g of O2 to H2O with excess H2

O2(g)+ 2H2(g)... 2H2O (l)

can someone show me how to do this?

Title: Re: what mass of H2O
Post by: Yggdrasil on April 04, 2008, 08:01:41 PM

How many moles of O₂ are in 32.00g of O₂?  How many moles of H₂O are formed from every mole of O₂?

Title: Re: what mass of H2O
Post by: 87mustang on April 04, 2008, 08:05:35 PM

so there are 2 mol of O2 in 32.00g   so how do i figure out how much excess?

Title: Re: what mass of H2O
Post by: 87mustang on April 04, 2008, 08:08:45 PM

ok let me understand the problem im trying to find the excess H2?

Title: Re: what mass of H2O
Post by: Yggdrasil on April 04, 2008, 08:15:49 PM

The question is not asking about the amount of excess H₂.  The question is saying that there is excess H₂ so that you do not have to worry about the amount of H₂.  In other words, the fact that you have excess H₂ means that oxygen gas is your limiting reagent (http://en.wikipedia.org/wiki/Limiting_reagent).