Answer:
21.44× 10² atoms
Explanation:
Number of chromium atoms = ?
Moles of potassium chromate = 3.56 × 10⁻²¹ mol
Solution:
1 mole of K₂CrO₄ contain 1 mole of Cr.
3.56 × 10⁻²¹ moles of K₂CrO₄ contain 3.56 × 10⁻²¹ moles of Cr.
Number of atoms of Cr:
1 mole contain 6.022× 10²³ atoms
3.56 × 10⁻²¹ mole × 6.022× 10²³ atoms / 1mol
21.44× 10² atoms or 2144 atoms
