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

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

= 0.00834 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

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

c.

explanation: