Question

Calculate number of calcium atom in 2.5mole of calcium

Answer 1

No. of gram atoms= given mass/atomic mass
2.5=x/40
x=40*2.5
=100g

Answer 2

$1.5\times 10^{24}$ atoms of calcium are there in 2.5 moles of calcium.

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

1 mole of calcium $Ca$ contains=$6.022\times 10^{23}$ atoms of calcium atoms

2.5 mole of calcium $Ca$ contains=$\frac{6.022\times 10^{23}}{1}\times 2.5= 1.5\times 10^{24}$ atoms of calcium

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