Question

8. Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide.

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Answer 1

Answer:

c) 22 g of carbon dioxide.

Explanation:

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Answer 2

Answer:

a.0.375 moles

b.1.11 moles

c.0.5moles

Explanation:

a.given mass =12g

molar mass of oxygen gas(O_2)=32 g

no.of moles =given mass /molar mass

=12/32

=0.375 moles

b.given mass=20 g

molar mass of water (H_2O )=18

no.of moles =20/18=1.11 moles

c.given mass =22g

molar mass of carbon dioxide (CO_2)=44

no.of moles =22/44=0.5 moles

(in case you are wondering how to calculate molar mass ,just add up the atomic mass of all the individual atoms present in that compound or molecule eg.molar mass of O_2 =16 +16=32.)