Question: What is the molecular weight of water (H2O)?
Options:
16 g/mol
18 g/mol
20 g/mol
22 g/mol
Correct Answer: 18 g/mol
Solution:
The molecular weight of water is calculated as (2*1) + (16) = 18 g/mol.
What is the molecular weight of water (H2O)?
Practice Questions
Q1
What is the molecular weight of water (H2O)?
16 g/mol
18 g/mol
20 g/mol
22 g/mol
Questions & Step-by-Step Solutions
What is the molecular weight of water (H2O)?
Step 1: Identify the elements in water (H2O). There are 2 hydrogen (H) atoms and 1 oxygen (O) atom.
Step 2: Find the atomic weight of hydrogen. The atomic weight of hydrogen is approximately 1 g/mol.
Step 3: Find the atomic weight of oxygen. The atomic weight of oxygen is approximately 16 g/mol.
Step 4: Calculate the total weight of hydrogen in water. Since there are 2 hydrogen atoms, multiply the atomic weight of hydrogen by 2: 2 * 1 g/mol = 2 g/mol.
Step 5: Add the total weight of hydrogen to the weight of oxygen: 2 g/mol (from hydrogen) + 16 g/mol (from oxygen) = 18 g/mol.
Step 6: Conclude that the molecular weight of water (H2O) is 18 g/mol.
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