1.

What mass of co2 will contain same number of atoms as are contained in 40g of oxygen?

Answer»

The molar MASS of OXYGEN is 32g. Thus, there are 6.022 X 1023 molecules of O2 in 32g of O2. 

So

 32g of O2 = 6.022 X 1023 molecules of O2

 1g of O2 = (6.022 X 1023 / 32) molecules of O2  

 40g of O2 = (6.022 X 1023 X 40) / 32 molecules of O2  

 = 7.5275 X 1023 molecules of O2

Thus, there are 7.5275 X 1023molecules of O2 in 40g of O2. Now, the molar mass of carbon dioxide gas (CO2) is 44G. Thus, there are 6.022 X 1023 molecules of CO2 in 44g of CO2. So

 mass of 6.022 X 1023 molecules of CO2 = 44g 

 mass of 1 molecule of CO2 = 44 / (6.023 X 1023) g 

 So, mass of 7.5275 X 1023 molecules of CO2 = (44 X 7.5275 X 1023) / (6.022 X 1023) g of CO2

 = 55g of CO2

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