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To find the number of moles in 20.0 g of HNO₂, you can follow these steps:
1. Calculate the molar mass of HNO₂ (Nitrous acid):
- H (Hydrogen) has a molar mass of approximately 1.01 g/mol.
- N (Nitrogen) has a molar mass of approximately 14.01 g/mol.
- O (Oxygen) has a molar mass of approximately 16.00 g/mol.
- Add up the molar masses of each element in HNO₂:
1.01 (H) + 14.01 (N) + 2(16.00) (2 O atoms) = 63.03 g/mol.
2. Use the formula:
Moles = Mass / Molar mass.
- Moles = 20.0 g / 63.03 g/mol ≈ 0.317 moles.
Therefore, there are approximately 0.317 moles in 20.0 g of HNO₂.
