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Question

The atomic weight 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?

A

y2

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B

y4

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C

y

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D

2y

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Solution

The correct option is C

y


Number of moles of A = x40

Number of atoms of A = x40 × Avogadro no. = y (say)

Or x = 40yAvogardo no.

Number of moles of B= 2x80

Number of atoms of B= 2x80 × Avogadro no.

= 2x80 ×40yAvogardo no × Avogadro no. = y


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