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### Topic: what mass of H2O  (Read 5269 times)

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#### 87mustang

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##### what mass of H2O
« 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?

#### Yggdrasil

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##### Re: what mass of H2O
« Reply #1 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?

#### 87mustang

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##### Re: what mass of H2O
« Reply #2 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?

#### 87mustang

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##### Re: what mass of H2O
« Reply #3 on: April 04, 2008, 08:08:45 PM »
ok let me understand the problem im trying to find the excess H2?

#### Yggdrasil

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##### Re: what mass of H2O
« Reply #4 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).