Question

Calculate the mass (in g) of 2.1 x 1026 atoms of Os.

Answer 1

66326.8 g Os

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

2.1 × 10²⁶ atoms Os

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Os - 190.2 g/mol

Step 3: Convert

`2.1 \cdot 10^(26) \ atoms \ Os((1 \ mol \ Os)/(6.022 \cdot 10^(23) \ atoms \ Os) )((190.2 \ g \ Os)/(1 \ mol \ Os) )` = 66326.8 g Os

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

66326.8 g Os ≈ 66000 g Os