i need help with chemistry homework how do i find grams?

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blue24

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the question is
if 1.25 of moles of butane are burned how many grams of butane were used?
 
The anser is 72.5.

A mole of butane is 58.12 (so just round to 58)
To get the correct amount of moles just multiply 58 by 1.25 and you get 72.5
 
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