Question

1. The molecular mass of hydrochloric acid (HCI) is 36.5 g/mol. How many moles of HCl are in 120g of HCI? ​

Answer 1

Answer:

3.3 mol HCl

General Formulas and Concepts:

Chemistry - Atomic Structure

• Using Dimensional Analysis

Explanation:

Step 1: Define

120 g HCl

Step 2: Identify Conversions

Molar Mass of HCl - 36.5 g/mol

Step 3: Convert

$120 \ g \ HCl(\frac{1 \ mol \ HCl}{36.5 \ g \ HCl} )$ = 3.28767 mol HCl

Step 4: Check

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

3.28767 mol HCl ≈ 3.3 mol HCl