Question

calculate the mass of CO2 which contain same no of atom as that in 2.8 g of CO .​

Answer 1

The molar mass of carbon dioxide is 44g. Thus, there are 6.022 X 1023 molecules of CO2 in 44g if CO2.

So

44g of CO2 = 6.022 X 1023 molecules of CO2

1g of CO2 = (6.022 X 1023 / 44) molecules of CO2

4.4g of CO2 = (6.022 X 1023 X 4.4) / 44 molecules of CO2

= 6.022 X 1022 molecules of CO2

Thus, there are 6.022 X 1022 molecules of CO2 in 4.4g of CO2. Now, the molar mass of nitrogen gas (N2) is 28g. Thus, there are 6.022 X 1023 molecules of N2 in 28g if N2. So

6.022 X 1023 molecules of N2 = 28g of N2

1 molecule of N2 = 28 / (6.023 X 1023) g of N2

So, 6.022 X 1022 molecules of N2 = (28 X 6.022 X 1022) / (6.022 X 1023) g of N2

= 2.8g of N2

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