Question

How many moles of HCL are in 18 grams? (Use the molar mass to convert miles to grams. Round you answer to 2 decimal places.)

Answer 1

Answer:

0.49 mol HCl

General Formulas and Concepts:

Chemistry - Atomic Structure

• Reading a Periodic Table
• Using Dimensional Analysis

Explanation:

Step 1: Define

18 g HCl

Step 2: Identify Conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar mass of HCl - 1.01 + 35.45 = 36.46 g/mol

Step 3: Convert

$18 \ g \ HCl(\frac{1 \ mol \ HCl}{36.46 \ g \ HCl} )$ = 0.493692 mol HCl

Step 4: Check

Round our answer to 2 decimal places.

0.493692 mol HCl ≈ 0.49 mol HCl

Answer 2

Answer:

0.49 mol

Explanation:

mol=given mass /molecular mass

: = 18/36.5

=0.49