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Chemistry µGCSE:

Moles + Masses

10 quick questions - for GCSE and iGCSE

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10 minutes maximum! (can you do it in 5?)


 
1. In Chemistry, the unit for the amount of a substance is the …
  • A. gram
  • B. kilogram
  • C. mole
  • D. cubic decimeter (dm3)

2. The relative formula mass, Mr, of MgCl2 is …     

  • A. 95
  • B. 46
  • C. 59.5
  • D. 95g

3. The molar mass of NaHCO3 is …

  • A. 84
  • B. 84g
  • C. 52
  • D. 52g
Sodium bicarbonate

4. Which of these is the correct formula for number of moles of a compound?

  • A. number of moles = mass (in g) x relative formula mass (Mr)
  • B. number of moles = mass (in g) ÷ relative formula mass (Mr)
  • C. number of moles = mass (in kg) x relative formula mass (Mr)
  • D. number of moles = mass (in kg) ÷ relative formula mass (Mr)

5. How many moles are there in 10g of NaOH ?    [Mrof NaOH = 40]

  • A. 4
  • B. 400
  • C. 0.25
  • D. 0.00025

6. What is the mass of 0.2 moles of CO2?  [Mr of CO2 = 44]

  • A. 8.8g
  • B. 220g
  • C. 0.00454g
  • D. 8.8kg

Q7-8: A farmer bought 40kg of the fertilizer ammonium nitrate, NH4NO3 .

7. The relative formula mass of ammonium nitrate is….

  • A. 42
  • B. 80
  • C. 45
  • D. 23

fertilizer

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8. The amount, in moles, of ammonium nitrate fertilizer purchased is….

  • A. 0.5
  • B. 2.0
  • C. 500
  • D. 3200

 

9. Carbon dioxide, CO2, is a greenhouse gas.

How many moles in 1.00 tonne of carbon dioxide?
[1 tonne = 1,000,000g]

  • A. 0.0227
  • B. 22.7
  • C. 22 727
  • D. 44

 

 

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10. Which of the following contains the greatest number of atoms?

  • A. 2 moles of carbon, C
  • B. 36g of carbon, C
  • C. 0.5 moles of magnesium, Mg
  • D. 48g of magnesium, Mg