Question

what is the number of molecules in Each of 32g O2 and 44g CO2​

Answer 1

To calculate moles we use the formula:

Moles = Mass (g) / Mr. The mass has been given in the questions as 44g.

The Mr of Carbon Dioxide is the sum of the atomic masses of the elements in the compound. The atomic mass of Carbon is 12 and the atomic mass of Oxygen is 16 therefore the molecular mass of carbon dioxide is: 12 + 16 + 16 = 44. We can then substitute the values into our equation at the start 44/44 = 1 so we have one mole of Carbon Dioxide.

To find out how many molecules this is we multiply the number of moles by Avagadro's Constant which will tell us how many molecules we have present. Avagadro's constant is equal to 6.023 x 10^23 so we have 1 x (6.023 x 10^23) molecules present which is 6.023 x 10^23.

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