Question

part c 22.867 g pt express your answers using four significant figures

Explanation:

Step1: Find molar mass of Pt

The molar mass of platinum (Pt) is approximately \( 195.08 \, \text{g/mol} \).

Step2: Calculate moles of Pt

Use the formula \( n = \frac{m}{M} \), where \( m = 22.867 \, \text{g} \) and \( M = 195.08 \, \text{g/mol} \).
\( n = \frac{22.867}{195.08} \approx 0.11722 \, \text{mol} \)

Step3: Calculate number of atoms

Use Avogadro's number \( N_A = 6.022 \times 10^{23} \, \text{atoms/mol} \). The number of atoms \( N = n \times N_A \).
\( N = 0.11722 \, \text{mol} \times 6.022 \times 10^{23} \, \text{atoms/mol} \approx 7.059 \times 10^{22} \, \text{atoms} \)

Answer:

\( 7.059 \times 10^{22} \) atoms