Question

Calculate the no.of moles in:

a) 52 g of He

b) 12 g of oxygen gas

c) 20 g of water



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Answer 1

Answer:

a) 13

b) 0.375

c) 1.11

Explanation:

We will use formula,

No. of moles

= given mass /[ molar mass(or atomic mass)]

a) No. of moles

=given mass of He / mass of 1 atom of He

= 52/ 4

= 13 moles

b) No. of moles

= given mass of oxygen gas /molar mass of O2

= 12/ (2 × 16)

= 3/8

= 0.375 moles

c) No. of moles

= given mass of water / molar mass of H2O

= 20/[ 2(1) +16]

= 20/18

= 10/9

= 1.11 moles

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