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.
