Question

Convert into mole: 03 1. 12g of oxygen gas. 2. 20g of water. 3. 22g of CO2​

Answer 1

Answer:

(a) Molecular weight of oxygen in grams = 32 g of oxygen= one mole of oxygen gas

Thus, 12 g of oxygen=

32

1

×12=0.375 moles

(b) Molecular weight of water (H

2

O) in grams= 2+ 16=18 g=one mole of water

Thus, 20 g of water=

18

1

×20=1.111 moles

(c) Molecular weight of carbon dioxide (CO

2

) in grams=12+2×16=44 g=one mole of carbon dioxide

Thus, 22 g of carbon dioxide =

44

1

×22=0.5 moles

Answer 2

Molar mass of oxygen = 16u.
Given mass=031.12g

To calculate the mole,
We know that n=m/M.
n=031.12/16
n=0.9145g


2) Molar mass=18u.
Given mass=20g

To calculate the mole,
n=m/M
n=20/18
n=1.11g

3) Molar mass=44u
Given mass=22g

To calculate the mole,
n=m/M
n=22/44
n=0.5 g

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