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​

Answer 1

Explanation:

The answer for this question is Y atoms itself.

Here is the explanation

It is given that X grams contains Y atoms. Now from this information we can form a relation:-

as X grams, hence no. of moles of A =X/40;

and therefore,total no. of atoms=( X/40)(Na) ( here Na=6.023* 10^23 i.e Avogadro’s number)

Similarly,

For atom B (but twice grams of A i.e 2X );

Total no. of atoms=(2X/80)Na=(X/40)Na=Y atoms.

therefore the answer is Y atoms.

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