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How many moles are in 50 grams of NaOH?

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Question: How many moles are in 50 grams of NaOH?

Options:

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

Correct Answer: 0.5

Solution: 

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 50 g / 40 g/mol = 1.25 moles.

How many moles are in 50 grams of NaOH?

Practice Questions

Q1
How many moles are in 50 grams of NaOH?
  1. 1
  2. 0.5
  3. 2
  4. 0.25

Questions & Step-by-Step Solutions

How many moles are in 50 grams of NaOH?
  • 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 / molar mass.
  • Step 4: Plug in the values: Number of moles = 50 grams / 40 g/mol.
  • Step 5: Calculate the result: 50 g / 40 g/mol = 1.25 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 definition of a mole to convert mass into moles using the formula: moles = mass / molar mass.
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