You can convert these over into moles by dividing by the molar mass of each substance
Moles of O2: 1.22 g / 32.00 g/mol = 0.0381 mol O2
Moles of H2: 1.05 g / 2.02 g/mol = 0.520 mol H2
Kelani A.
asked • 04/04/16Can someone please explain to me how to convert this?
1.Converting 1.22g of O2 to moles?
2.Converting 1.05g of H2 to moles?
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2 Answers By Expert Tutors
Bob F. answered • 04/04/16
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These are trivial. Please read your classroom material on Avogadro's number.
Bob F.
I mean this is fairly straightforward. If you know the molecular mass of something, then you know the mass of a mole of that something.
To solve one of these, for example - the oxygen question:
The molecular mass of O2 is 32 grams - that means that 32 grams of O2 is 1 mole of O2. If 1 mole is 32 grams, then how many moles is 1.22 grams?
Let's do a dimensional analysis: 1.22 g O2 x 1 mole O2 / 32 g O2 = 0.038 mole O2
Even though we did this using a dimensional analysis technique, it is clearly a simple proportion.
I think you should try the H2 problem.
I'd be pleased to work with you to help you with this and then the more advanced concepts of stoichiometry and balancing equations.
Bob
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Kelani A.
04/04/16