Question

How many moles are equal to a 0.25g sample of chromium?

Answer 1

0.0048 mol Cr

Step-by-step explanation:

Step 1: Define

Molar Mass of Chromium (Cr) - 52.00 g/mol

Step 2: Use Dimensional Analysis

`0.25 \hspace{3} g \hspace{3} Cr(\frac{1 \hspace{3} mol \hspace{3} Cr}{52.00 \hspace{3} g \hspace{3} Cr} )` = 0.004808 mol Cr

Step 3: Simplify

We are give 2 sig figs.

0.004808 mol Cr ≈ 0.0048 mol Cr