Question

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

9. What is the mass of:
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?

grd 9
explained answer fast​

Answer 1

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Use this formula

No. Of mole = Given mass / Molar mass

You can find for both situation by applying this formula

Answer 2

Answer:

(a) 32 g of oxygen gas = 1 mole

Then, 12 g of oxygen gas = 12 / 32 mole = 0.375 mole

(b) 18 g of water = 1 mole

Then, 20 g of water = 20 / 18 mole = 1.111 mole

(c) 44 g of carbon dioxide = 1 mole

Then, 22 g of carbon dioxide = 22 / 44 mole = 0.5 mole.