Answer:
2.63×10²² atoms
Explanation:
From the question given above, the following data were obtained:
Mass of calcium (Ca) = 1.75 g
Number of atoms of calcium (Ca) =?
From Avogadro's hypothesis,
1 mole of Ca = 6.02×10²³ atoms
Recall:
1 mole of Ca = 40 g
Thus,
40 g of Ca = 6.02×10²³ atoms
Finally, we shall determine the number atoms in 1.75 g of calcium. This can be obtained as follow:
From Avogadro's hypothesis,
40 g of Ca = 6.02×10²³ atoms
Therefore,
1.75 g of Ca = 1.75 × 6.02×10²³ / 40
1.75 g of Ca = 2.63×10²² atoms
Thus, 1.75 g of Ca contains 2.63×10²² atoms.
