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If 10 grams of NaOH are dissolved in water, how many moles of NaOH are present?

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Question: If 10 grams of NaOH are dissolved in water, how many moles of NaOH are present? (Molar mass of NaOH = 40 g/mol)

Options:

  1. 0.25 moles
  2. 0.5 moles
  3. 1 mole
  4. 2.5 moles

Correct Answer: 0.5 moles

Solution: 

To find the number of moles, use the formula: moles = mass/molar mass. Thus, 10 g / 40 g/mol = 0.25 moles.

If 10 grams of NaOH are dissolved in water, how many moles of NaOH are present?

Practice Questions

Q1
If 10 grams of NaOH are dissolved in water, how many moles of NaOH are present? (Molar mass of NaOH = 40 g/mol)
  1. 0.25 moles
  2. 0.5 moles
  3. 1 mole
  4. 2.5 moles

Questions & Step-by-Step Solutions

If 10 grams of NaOH are dissolved in water, how many moles of NaOH are present? (Molar mass of NaOH = 40 g/mol)
Correct Answer: 0.25 moles
  • Step 1: Identify the mass of NaOH you have, which is 10 grams.
  • Step 2: Identify the molar mass of NaOH, which is given as 40 grams per mole.
  • Step 3: Use the formula to calculate moles: moles = mass / molar mass.
  • Step 4: Substitute the values into the formula: moles = 10 grams / 40 grams per mole.
  • Step 5: Perform the division: 10 / 40 = 0.25.
  • Step 6: Conclude that there are 0.25 moles of NaOH present.
  • Mole Concept – Understanding the relationship between mass, molar mass, and the number of moles in a substance.
  • Molar Mass Calculation – Using the molar mass of a compound to convert between grams and moles.
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