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

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

Some Basic Concepts of Chemistry

Solution:

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