Question

What is the mass of 3.02 x 1025 formula units of barium nitrate?

Answer 1

10000 g BaNO₃

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

3.02 × 10²⁵ formulas units BaNO₃

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Ba - 137.33 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of BaNO₃ - 137.33 + 14.01 + 3(16.00) = 199.34 g/mol

Step 3: Convert

`3.02 \cdot 10^(25) \ formula \ units \ BaNO_3((1 \ mol \ BaNO_3)/(6.022 \cdot 10^(23) \ formula \ units \ BaNO_3) )((199.34 \ g \ BaNO_3)/(1 \ mol \ BaNO_3) )` = 9996.79 g BaNO₃

Step 4: Check

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

9996.79 g BaNO₃ ≈ 10000 g BaNO₃