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How many grams of NaOH are needed to prepare 0.5 moles of NaOH solution? (Molar

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Question: How many grams of NaOH are needed to prepare 0.5 moles of NaOH solution? (Molar mass of NaOH = 40 g/mol)

Options:

  1. 20 g
  2. 40 g
  3. 10 g
  4. 30 g

Correct Answer: 20 g

Solution: 

To find the mass, use the formula: mass = moles × molar mass. Thus, 0.5 moles × 40 g/mol = 20 g.

How many grams of NaOH are needed to prepare 0.5 moles of NaOH solution? (Molar

Practice Questions

Q1
How many grams of NaOH are needed to prepare 0.5 moles of NaOH solution? (Molar mass of NaOH = 40 g/mol)
  1. 20 g
  2. 40 g
  3. 10 g
  4. 30 g

Questions & Step-by-Step Solutions

How many grams of NaOH are needed to prepare 0.5 moles of NaOH solution? (Molar mass of NaOH = 40 g/mol)
  • Step 1: Identify the number of moles of NaOH you need, which is 0.5 moles.
  • Step 2: Find the molar mass of NaOH, which is given as 40 g/mol.
  • Step 3: Use the formula to calculate mass: mass = moles × molar mass.
  • Step 4: Substitute the values into the formula: mass = 0.5 moles × 40 g/mol.
  • Step 5: Calculate the result: 0.5 × 40 = 20 grams.
  • Mole Concept – Understanding the relationship between moles, molar mass, and mass of a substance.
  • Molar Mass Calculation – Using the molar mass to convert between moles and grams.
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