Some Basic Concepts Of Chemistry Question 176
Question: The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B
Options:
A) $ \frac{y}{2} $
B) $ \frac{y}{4} $
C) y
D) 2y
Show Answer
Answer:
Correct Answer: C
Solution:
Number of moles of A $ =\frac{x}{40} $
Number of atoms of A $ =\frac{x}{40}\times Avogadro\ no\text{.}=y $ (say) Or $ x=\frac{40y}{\text{Avogadro no}\text{.}} $
Number of moles of B $ =\frac{2x}{80} $
Number of atoms of B $ =\frac{2x}{80}\times Av\text{. no}\text{.}=\frac{2}{80}\times \frac{40y}{Av\text{. no}\text{.}}\times Av\text{. no}\text{.}=y $
