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1. The molar mass of O atoms is 16 g/mol. What is the mass of one oxygen atom?

2. How many O2 molecules are there in one mole of oxygen gas?
3. Calculate the number of O atoms in 54 g of water. M (H2O) = 18 g/mol


2. 2 molecules are their.
3. no.of atom of hydrogen=6.022*10 (23)*2*54

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