Question

HOla Mates !!

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Convert the following :

1) 12 g of oxygen gas

2) 20 g of water

3) 22 g of carbon dioxide

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Chemistry

Class 9th

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Answer 1

Molar mass of O2 = 2 x 16 = 32 g

Number of moles in 12g O2 = Given mass/ Molar mass = 12/32 = 0.375 mole

 

(b) Molar mass of H2O = 2 x 1 + 16 = 18g

Number of moles in 20 g H2O = 20/18 = 1.11mole

 

(c) Molar mass of CO2 = 12 + 16 x 2 = 12 + 32 = 44g

Number of moles in 22g CO2 = 22/44 = 0.5mole

Answer 2

$<b>Heya !$

Here's your answer !!

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No. of moles ( n ) = $\frac{Given \: mass ( m )}{Molar \: mass ( M )}$

QUESTION 1

Molar mass of Oxygen =

=> 2 × 16 g ${mol}^{-1} = 32 g {mol}^{-1}$

Therefore ,

No. of moles in 12 g of oxygen =

=> $\frac{12 g }{32 g {mol}^{-1}}$

=> 0.375 mole

QUESTION 2

Molar mass of Water =

=> 2 × 1.0 + 16 g ${mol}^{-1} = 18 g {mol}^{-1}$

Therefore ,

No. of moles in 20 g of water =

=> $\frac{20 g }{18 g {mol}^{-1}}$

=> 1.11 mole

QUESTION 3

Molar mass of Carbon Dioxide =

=> 12 + 2 × 16 g ${mol}^{-1} = 44 g {mol}^{-1}$

Therefore ,

No. of moles in 22 g of oxygen =

=> $\frac{22 g }{44 g {mol}^{-1}}$

=> 0.5 mole

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Thanks !!