Question

Calculate the number of particles in \(128\ \text{gm}\) sulphur.

• A. \(40.176\times10^{23}\)
• B. \(24.08\times10^{23}\)
• C. \(12.04\times10^{23}\)
• D. \(6.02\times10^{23}\)

Hint:

Number of particles \(=\) number of moles \(\times\) Avogadro's number.

Answer 1

The Correct Option is B

Concept:
Number of particles is calculated using Avogadro's number: \[ N=nN_A \] where, \[ n=\text{number of moles} \] and \[ N_A=6.02\times10^{23} \]

Step 1: Atomic mass of sulphur. \[ \text{Atomic mass of sulphur}=32\ \text{g/mol} \]

Step 2: Calculate number of moles. \[ n=\frac{128}{32} \] \[ n=4 \]

Step 3: Calculate number of particles. \[ N=4\times6.02\times10^{23} \] \[ N=24.08\times10^{23} \] \[ \therefore \text{Correct Answer is (B)} \]