The number of molecules in 1.0 mole of H2O is _ as in one mole of O2

The same.

Explanation:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules.

This implies that 1 mole of H2O contains 6.02×10²³ molecules and also, 1 mole of O2 contains 6.02×10²³.

From the above illustration, we can see that 1 mole of H2O and 1 mole of O2 contains 6.02×10²³ molecules respectively.

Therefore, the number of molecules in 1 mole of H2O is the same as in 1 mole of O2.

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