Question

how many atoms are there in 5.0 moles of calcium? (Ca= 40)​

Answer 1

Answer:

3×10²⁴

Explanation:

No. of Atoms = No. of moles × Avogadro's No.

No. of Atoms = 5× 6×10²³

No. of Atoms = 30×10²³

= 3×10²⁴

Answer 2

Answer:

The number of atoms in 5 moles of calcium is 3.011 × $10^{24}$

Explanation:

Calcium is a chemical element and it has an atomic number of 20

Given the molar mass of calcium = 40 g/mol

We know that the one mole of an element contains an Avogadro number of atoms.

That is one-mole calcium contains 6.022 × $10^{23}$ atoms

Therefore, the number of atoms in 5 mol = 5 × 6.022 × $10^{23}$

                                                                     = 3.011 × $10^{24}$ atoms