Question

The atomic masses of two elements (P and Q) are 20 and 40 respectively. x g of P contains y atoms,

how many atoms are present in 2x g of Q?​

Answer 1

Consider x gram as a gram.

$\large\rm { P = 20}$

$\large\rm { P = \frac {w}{M} × N_{A} = \frac {a}{20} × N_{A} = b .........(1) }$

$\large\rm { Q = 40}$

$\large\rm { Q = \frac {2a}{40} × N_{A} = X }$

$\large\rm { Q = \frac {a}{20} × N_{A} = X }$

$\large\rm { \ From \ equation \ 1 \ ; \ \frac {a}{20} × N_{A} = b }$

$\large\rm { \therefore X = b }$

$\large\rm { \therefore \ 2a }$ gm of Q contains b atom