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How many grams are in 0.25 moles of KCl?

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Question: How many grams are in 0.25 moles of KCl?

Options:

  1. 35 g
  2. 70 g
  3. 17.5 g
  4. 140 g

Correct Answer: 70 g

Solution: 

Molar mass of KCl = 39 + 35.5 = 74.5 g/mol. Mass = moles x molar mass = 0.25 moles x 74.5 g/mol = 18.625 g.

How many grams are in 0.25 moles of KCl?

Practice Questions

Q1
How many grams are in 0.25 moles of KCl?
  1. 35 g
  2. 70 g
  3. 17.5 g
  4. 140 g

Questions & Step-by-Step Solutions

How many grams are in 0.25 moles of KCl?
Correct Answer: 18.625 g
  • Step 1: Find the molar mass of KCl. K (potassium) has a mass of 39 grams/mol and Cl (chlorine) has a mass of 35.5 grams/mol.
  • Step 2: Add the masses of K and Cl together: 39 g/mol + 35.5 g/mol = 74.5 g/mol.
  • Step 3: Use the formula to find mass: Mass = moles x molar mass.
  • Step 4: Substitute the values into the formula: Mass = 0.25 moles x 74.5 g/mol.
  • Step 5: Calculate the mass: 0.25 x 74.5 = 18.625 grams.
  • Molar Mass Calculation – Understanding how to calculate the molar mass of a compound by summing the atomic masses of its constituent elements.
  • Moles to Grams Conversion – Applying the formula to convert moles to grams using the molar mass.
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