Question

Calculate mass of sodium which contains same number of atoms as are present in 4g of calcium.

Answer 1

Moles Ca = 4 g / 40 = 0.,1
= moles Na 
Mass Na = 0.1 mol x 23 g/mol = 2.3g

Answer 2

Answer: The mass of sodium containing same number of atoms is 2.3 grams.

Explanation:

To calculate the number of moles, we use the equation:

$text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$    .....(1)

Moles of calcium:

Given mass = 4 g

Molar mass = 40 g/mol

Putting values in above equation:

$\text{Moles of calcium}=\frac{4g}{40g/mol}=0.1mol$

We need to calculate the mass of sodium having same number of atoms which means having same number of moles.

So, moles of sodium = 0.1 mole

For Sodium:

Molar mass = 23 g/mol

Putting values in equation 1:

[tex]0.1mol=\frac{\text{mass of sodium}}{23g/mol}\\\\ \text{Mass of sodium}=2.3g[/tex]

Hence, the mass of sodium containing same number of atoms is 2.3 grams.