Question

calculate the number of moles for 34g of carbon

Answer 1

Hi friend
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Your answer
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NOW,
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Molecular mass of Carbon = 12 u

so,
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Number of moles in 12 gm of Carbon = 1 mole

Number of moles in 1 gm of carbon = 1/12 mole

Number of moles in 34 gm of Carbon = ( 1/12 × 34 ) moles = 2.833 moles

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Answer 2

using formula
no. of moles =given mass/molecular mass
so

moles=34/12
no. of moles =2.8