Question

Find the number of moles
1) 5g of Ca 2) 108g of Al

Ca = 14u, Al = 27u
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Answer 1

Answer:

MOLES = GIVEN MASS / MOLAR MASS

1.) 5G OF Ca

N = 5 / 40

= 1 / 8

= 0.125 MOLES

Explanation:

2.) 108G OF AL

N = 108 / 27

= 4 MOLES

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Answer 2

Answer:

1) Molar mass of Calcium=40.078 g/mol. So numbers of moles =5.00/40.078=0.125 mol.

2) Given that mass of aluminium=108g

Molar mass =27g/mol

Number of moles= Molar  mass  of  aluminiumMass  of  aluminium

Number of moles= 27g/mol108g

⇒ Number of moles=4 mol

Thus, the number of moles in 108 grams of aluminium is 4 mol.

Explanation:

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