If you had 15g of O2,how many moles would you have reacting
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If you had 15g of O2,how many moles would you have reacting

[From: ] [author: ] [Date: 12-02-02] [Hit: ]
If you have 15 grams, then you should notice that you have about a half a mole of molecules.n=(15)/(32.n=0.47 mol.To test yourself further,......
Can you explain how I'd calculate this please?

Thank you

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Simple, the molar mass of oxygen gas is 32.00 grams for every mole of molecules. If you have 15 grams, then you should notice that you have about a half a mole of molecules.

Therefore your answer should be:

M=m/n
n=m/M
n=(15)/(32.00)
n=0.47 mol.

To test yourself further, calculate how many molecules this is.

***Hint: Molecules=moles*Avoogadro's number

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To find the number of moles of O2 in 15g, divide by the molar mass.
15g / 32g/mol = .469mol
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