Question

find the number of moles in 51g of aluminium
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Answer 1

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☆ The number of mole of the element is equal the sample mass of element divide over the atomic mass of the element

In simple formula

♤ n= ms ÷ Mwt

◇ Given

• ms = sample mass = 51g

• Mwt= atomic mass of Al = 27

So,

☆ n= 51÷27=1.89 mol

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