Question

If x g of A (atomic mass 50) contains n atoms, how many atoms are there in 20x g 3.32 of elements B (atomic weight 100).

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Answer 1

Answer:10n

Explanation:

The number of atoms in 1 mole of a substance is equal to the Avogadro's number which is 6.022×1023

. The number of moles of any substance is given by:

m=given mass molar mass/atomic mass

Therefore the number of atoms of A is given by

n=Nagiven massmolar mass/atomic mass

Where N is the Avogadro number

For atom A, we have

na=Nax50nb=Na20x100

Dividing the 2 equations, we get:

nbna=50(20x)100x

nb=10na