Question

The atomic masses of two elements $A$ and $B$ are $20$ and $40$ respectively. If $x$ g of $A$ contains $y$ atoms, how many atoms are present in $2xg$ of $B$?

• A. $y$
• B. $1.5y$
• C. $2y$
• D. $Noneofthese$

Answer 1

Answer: (A)

$y$

As we know,
$\text{Mole}\times N_o=\text{Number of atoms}$
So, according to given conditions,
$x\times \frac{N_o}{20}=y$
Therefore, $2x\times \frac{N_o}{40}=y$
Hence, $2x$ g of $B$ will contain $y$ atoms.