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How many moles are in 10 grams of NaOH?

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Question: How many moles are in 10 grams of NaOH?

Options:

  1. 0.25
  2. 0.5
  3. 0.75
  4. 1

Correct Answer: 0.25

Solution: 

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 10 g / 40 g/mol = 0.25 moles.

How many moles are in 10 grams of NaOH?

Practice Questions

Q1
How many moles are in 10 grams of NaOH?
  1. 0.25
  2. 0.5
  3. 0.75
  4. 1

Questions & Step-by-Step Solutions

How many moles are in 10 grams of NaOH?
Correct Answer: 0.25 moles
  • Step 1: Find the molar mass of NaOH. This is done by adding the atomic masses of sodium (Na), oxygen (O), and hydrogen (H). Sodium has a mass of 23 g/mol, oxygen has a mass of 16 g/mol, and hydrogen has a mass of 1 g/mol.
  • Step 2: Calculate the total molar mass: 23 g/mol (Na) + 16 g/mol (O) + 1 g/mol (H) = 40 g/mol.
  • Step 3: Use the formula to find the number of moles: Number of moles = mass (in grams) / molar mass (in g/mol).
  • Step 4: Plug in the values: Number of moles = 10 g / 40 g/mol.
  • Step 5: Calculate the result: 10 g / 40 g/mol = 0.25 moles.
  • Molar Mass Calculation – Understanding how to calculate the molar mass of a compound by summing the atomic masses of its constituent elements.
  • Mole Concept – Applying the mole concept to convert mass of a substance to the number of moles using the formula: moles = mass / molar mass.
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