Question

calculate the mass of 2.5 gram atom of calcium

Answer 1

The mass of 2.5 gm atom of calcium is 100 gm.

This is explained below:

When we refer to mass, we mean the molar mass of any substance. Molar mass is the "total weight" of the substance for one mole of that substance. We also know that one mole equals to the "molecular weight" of a substance. The molecular weight is also the atomic mass of the substance.

In this case, the molecular weight or atomic mass of calcium is 40 gm.

$\text{Number of atoms} =\frac{\text {Given mass}}{\text {Atomic mass}}$

$\Rightarrow 2.5=\frac{\text {Given mass}}{40}$

$\Rightarrow \text { Given mass }=2.5 \times 40$

$\therefore \text { Given mass }=100 \ \mathrm{gm}$

Answer 2

Answer:

Explanation: Molar mass of calcium =40

Given mass =2.5 g

So, mass of 2.5 g of calcium =40 *2.5 =100 gm