Question

How many moles of copper are in a 0.53 gram sample?

Answer 1

Answer:

8.3 × 10⁻³ mol Cu

Explanation:

Step 1: Define

Molar Mass of Cu - 63.55 g/mol

Given 0.53 g Cu

Step 2: Use Dimensional Analysis

$0.53 \hspace{3} g \hspace{3} Cu(\frac{1 \hspace{3} mol \hspace{3} Cu}{63.55 \hspace{3} g \hspace{3} Cu} )$ = 0.00834 mol Cu

Step 3: Convert

0.00834 mol Cu = 8.34 × 10⁻³ mol Cu

Step 4: Simplify

We are given 2 sig figs.

8.34 × 10⁻³ mol Cu ≈ 8.3 × 10⁻³ mol Cu