Question

Which of the following will contain same number of atoms as 20g of calcium?

• A. 24g magnesium
• B. 12g carbon
• C. 8g oxygen gas
• D. 16 g oxygen atom

Answer 1

Answer: (C)

8g oxygen gas

Answer 2

(3)

Mole of calcium $= \frac{20}{40} = 0.5$

Mole of maginesium $= \frac{24}{24} = 1$

Mole of carbon $= \frac{12}{12} = 1$

Mole oxygen atom in 8 g $= \frac{8}{16} = 0.5$

Mole of oxygen atom in 16 g $= \frac{16}{8} = 1$

Hence option (3) is correct