Question

Which of the following contains the greatest number of atoms?

• A. 1.0 g of butane (C4H10)
• B. 1.0 g of nitrogen (N2)
• C. 1.0 g of silver (Ag)
• D. 1.0 g of water (H2O)

Answer 1

Answer: (A)

1.0 g of butane (C4H10)

Answer 2

Compound	mole of molecule	mole of atom	No. of atom
C4H10	$$\frac{1}{58}$$	14 × $\frac{1}{58}$	$\frac{14}{58}$NA
N2	$$\frac{1}{28}$$	2 × $\frac{1}{28}$	$\frac{1}{14}$NA
Ag	$$\frac{1}{108}$$	$$\frac{1}{108}$$	$\frac{1}{108}$NA
H2O	$$\frac{1}{18}$$	3× $\frac{1}{18}$	$$\frac{N_{A}}{6}$$

Hence C4H10 has maximum number of atoms.