Question

What is the mass of 7.00 moles of H2O2

Answer 1

238.14

Step-by-step explanation:

2 H + 2O

2(1.01) + 2(16.00) = 34.02

34.02*7 = 238.14

238.14

Answer 2

0.206 mol H₂O₂

General Formulas and Concepts:

Chemistry - Atomic Structure

• Reading a Periodic Table
• Using Dimensional Analysis

Step-by-step explanation:

Step 1: Define

7.00 moles H₂O₂

Step 2: Identify Conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O₂ - 2(1.01) + 2(16.00) = 34.02 g/mol

Step 3: Convert

`7.00 \ g \ H_2O_2((1 \ mol \ H_2O_2)/(34.02 \ g \ H_2O_2) )` = 0.205761 mol H₂O₂

Step 4: Check

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

0.205761 mol H₂O₂ ≈ 0.206 mol H₂O₂