Chemistry
Grade-9
Easy
Question
In which of the following pairs do 1 g of each have an equal number of molecules?
- N2O and CO
- CO and NO
- N2O and CO2
- All the above
Hint:
Equal number of moles of any compound has equal number of molecules.
The correct answer is: N2O and CO2
Molecular mass of N2O = (28 + 16)g = 44g (atomic mass of nitrogen and oxygen 14 and 16 respectively)
Molecular mass of CO2 = (12 + 32)g = 44g ( atomic mass of carbon and oxygen are 12 and 16 respectively)
Equal number of moles of any compound has equal number of molecules.
Molecular mass of N2O and CO2 are equal. Therefore, 1g of N2O & CO2 each have an equal number of molecules.
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