Find the weight of H2O in 7 moles.
Understand the Problem
The question is asking us to find the weight of water (H₂O) in 7 moles, which requires knowledge of molar mass and the conversion between moles and grams.
Answer
The weight of 7 moles of H₂O is 126 g.
Answer for screen readers
The weight of 7 moles of H₂O is 126 g.
Steps to Solve
- Determine the molar mass of H₂O
The molar mass of water (H₂O) is calculated by adding the molar masses of its constituent elements.
- Hydrogen (H) has a molar mass of approximately 1 g/mol.
- Oxygen (O) has a molar mass of approximately 16 g/mol.
Thus, the molar mass of H₂O can be calculated as: $$ \text{Molar mass of H₂O} = 2 \times \text{molar mass of H} + 1 \times \text{molar mass of O} = 2 \times 1, \text{g/mol} + 16, \text{g/mol} = 18, \text{g/mol} $$
- Calculate the weight of 7 moles of H₂O
To find the weight, use the formula: $$ \text{Weight} = \text{number of moles} \times \text{molar mass} $$
For 7 moles of water: $$ \text{Weight} = 7 , \text{moles} \times 18 , \text{g/mol} = 126 , \text{g} $$
The weight of 7 moles of H₂O is 126 g.
More Information
Water is essential for life and has a simple molecular structure. The molar mass calculation is a fundamental concept in chemistry, allowing us to convert between moles and grams.
Tips
- Forgetting to account for both hydrogen atoms in H₂O (leading to an incorrect molar mass).
- Confusing grams with moles; remember that weight is expressed in grams.
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