1. What is Molar Mass of Water?

The molar mass of water (H₂O) is the mass of one mole of water molecules. It's calculated by adding the atomic masses of two hydrogen atoms (1.00784 u each) and one oxygen atom (15.999 u), resulting in approximately 18.01528 g/mol.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Mass — The resulting mass in grams
• Moles — The amount of substance in moles
• Molar Mass — The mass of one mole of water (18.01528 g/mol)

Explanation: For 2 moles of water, the calculation is simply 2 × 18.01528 g/mol = 36.0306 grams.

3. Importance of Molar Mass Calculation

Details: Calculating mass from moles is fundamental in chemistry for preparing solutions, stoichiometric calculations, and understanding chemical reactions.

4. Using the Calculator

Tips: Enter the number of moles of water you want to calculate (default is 2). The calculator will compute the corresponding mass in grams.

5. Frequently Asked Questions (FAQ)

Q1: Why is the molar mass of water approximately 18 g/mol?
A: Water (H₂O) contains two hydrogen atoms (≈1 g/mol each) and one oxygen atom (≈16 g/mol), totaling ≈18 g/mol.

Q2: What's the difference between moles and mass?
A: Moles measure the number of particles (6.022×10²³ particles per mole), while mass measures the actual weight in grams.

Q3: How accurate is this calculation?
A: Very accurate for pure water at standard conditions, using the most recent IUPAC atomic weights.

Q4: Does this work for other substances?
A: Yes, but you'd need to use the appropriate molar mass for each substance.

Q5: Why is the default set to 2 moles?
A: Because the calculator is specifically designed to show the mass of 2 moles of water, which is a common educational example.