The mass of 2 mole of sodium hydroxide will be
Correct answer: D. 80 g
- A. 2 g
- B. 20 g
- C. 40 g
- D. 80 g
Explanation
To find the mass of 2 moles of sodium hydroxide (NaOH), you need to know the molar mass of NaOH and then use the formula:Mass=Number of moles×Molar massMass=Number of moles×Molar massMolar mass of sodium hydroxide (NaOH):Sodium (Na) has a molar mass of approximately 22.99 g/mol.Oxygen (O) has a molar mass of approximately 16.00 g/mol.Hydrogen (H) has a molar mass of approximately 1.01 g/mol.So, the molar mass of NaOH is 22.99+16.00+1.01=40.0022.99+16.00+1.01=40.00 g/mol.Calculate the mass of 2 moles of NaOH: Mass=Number of moles×Molar massMass=Number of moles×Molar mass Mass=2 mol×40.00 g/molMass=2mol×40.00g/mol Mass=80.00 g
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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