How many moles are in 83.1g of H2O

4.61 mol H₂O

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

83.1 g H₂O

Step 2: Identify Conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

= 4.61154 mol H₂O

Step 4: Check

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

4.61154 mol H₂O ≈ 4.61 mol H₂O

100c is waters boiling point

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).