Question

What is the mass of 3.01 x 10^21 atoms of Co

Answer 1

0.295 g Co

General Formulas and Concepts:

Chemistry - Atomic Structure

• Reading a Periodic Table
• Using Dimensional Analysis
• Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Step-by-step explanation:

Step 1: Define

3.01 × 10²¹ atoms Co

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Co - 58.93 g/mol

Step 3: Convert

`3.01 \cdot 10^(21) \ atoms \ Co((1 \ mol \ Co)/(6.022 \cdot 10^(23) \ atoms \ Co) )((58.93 \ g \ Co)/(1 \ mol \ Co) )` = 0.294552 g Co

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

0.294552 g Co ≈ 0.295 g Co