Answer:
3.01×10²³ molecules.
Explanation:
From the question given above, the following data were obtained:
Mass of water, H₂O = 9 g
Molecules of water, H₂O =?
From Avogadro's hypothesis,
1 mole = 6.02×10²³ molecules
Next, we shall determine the mass of 1 mole of water, H₂O.
1 mole of water, H₂O = (1×2) + 16 = 18 g
Thus,
18 g of water, H₂O = 6.02×10²³ molecules
Finally, we shall determine the number of molecules in 9 g of water, H₂O. This can be obtained as follow:
18 g = 6.02×10²³ molecules
Therefore,
9 g = 9 g × 6.02×10²³ molecules / 18 g
9 g = 3.01×10²³ molecules
Thus, 9 g of water, H₂O contains 3.01×10²³ molecules.
