Question

Solve this :

8. What is the mass of :
(a) 0.2 mole of oxygen atoms (O = 16)
(b) 0.5 mole of water molecules ? (H = 1, O = 16)

Answer 1

Dear Student,

A)
No, of mole = mass /molecular mass
Mw of O₂= 16
mass of 0.2 moles of O₂= no. of mole $\times$ molecular mass
= 0.2 $\times$ 16
=3.2 g


B) molecular mass of H₂O = 18
mass of 0.5 mole of H₂O = 0.5$\times$18
= 9 g


Regards
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