Answer:
6.69×10²⁵ molecules
Step-by-step explanation:
From the question given above, the following data were obtained:
Mass per bottle of water = 500 g
Number of molecules of water =?
Next, we shall determine the mass of 4 bottles of water. This can be obtained as follow:
1 bottle = 500 g of water
Therefore,
4 bottles = 4 × 500
4 bottles = 2000 g of water.
Finally, we shall determine the number of molecules of in 2000 g of water. This can be obtained as follow:
From Avogadro's hypothesis:
1 mole = 6.02×10²³ molecules.
1 mole of water (H₂O) = (2×1) + 16
= 2 + 16
= 18 g
Thus, we can say that:
18 g of water = 6.02×10²³ molecules.
Therefore,
2000 g = 2000 × 6.02×10²³ / 18
2000 g = 6.69×10²⁵ molecules
From the calculations made above, we can conclude that the chemist consumes 6.69×10²⁵ molecules of water daily.