Question: Calculate the molar mass of water (H2O).
Options:
16 g/mol
18 g/mol
20 g/mol
22 g/mol
Correct Answer: 18 g/mol
Solution:
The molar mass of water is calculated as follows: H (1 g/mol) x 2 + O (16 g/mol) = 18 g/mol.
Calculate the molar mass of water (H2O).
Practice Questions
Q1
Calculate the molar mass of water (H2O).
16 g/mol
18 g/mol
20 g/mol
22 g/mol
Questions & Step-by-Step Solutions
Calculate the molar mass 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 molar mass of hydrogen (H). It is 1 gram per mole (g/mol).
Step 3: Since there are 2 hydrogen atoms, multiply the molar mass of hydrogen by 2: 1 g/mol x 2 = 2 g/mol.
Step 4: Find the molar mass of oxygen (O). It is 16 grams per mole (g/mol).
Step 5: Add the total molar mass of hydrogen to the molar mass of oxygen: 2 g/mol (from H) + 16 g/mol (from O) = 18 g/mol.
Step 6: The final result is the molar mass of water, which is 18 g/mol.
Molar Mass Calculation – The process of determining the mass of one mole of a substance by summing the atomic masses of its constituent elements.
Chemical Formula Interpretation – Understanding how to interpret the chemical formula of a compound to identify the number of each type of atom present.
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