xg of element P (atomic weight 15 ) contains y atoms. How many atoms are contained in 2x g of element Q (atomic weight 30 )?

Question

xg of element P (atomic weight 15 ) contains y atoms. How many atoms are contained in 2x g of element Q (atomic weight 30 )? (A) 2y (B) 4y (C) (1/2) y (D) y

Tardigrade Admin · Accepted Answer

Number of moles of P=(x/15) Number of moles of Q=(2 x/30)=(x/15) Equal moles contains equal number of atoms

Q. $xg$ of element $P$ (atomic weight 15 ) contains $y$ atoms. How many atoms are contained in $2 xg$ of element $Q$ (atomic weight 30 )?

$2 y$

$4 y$

$\frac{1}{2} y$

$y$

Number of moles of $P = \frac{x}{15}$

Number of moles of $Q = \frac{2 x}{30} = \frac{x}{15}$

Equal moles contains equal number of atoms

Q. xg of element P (atomic weight 15 ) contains y atoms. How many atoms are contained in 2xg of element Q (atomic weight 30 )?

2y

4y

21​y

y

Number of moles of P=15x​ Number of moles of Q=302x​=15x​ Equal moles contains equal number of atoms

Q. $xg$ of element $P$ (atomic weight 15 ) contains $y$ atoms. How many atoms are contained in $2 xg$ of element $Q$ (atomic weight 30 )?

$2 y$

$4 y$

$\frac{1}{2} y$

$y$

Number of moles of $P = \frac{x}{15}$

Number of moles of $Q = \frac{2 x}{30} = \frac{x}{15}$

Equal moles contains equal number of atoms