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Chemistry µIB
1.2a Moles + Particles
10 quick questions

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10 minutes maximum!

An IB Periodic Table is required. Calculators should not be used!

 

1. What amount (in moles) is present in 8.0g of sodium hydroxide, NaOH?

sodium hydroxide

  • A.   5.0
  • B.   2.5
  • C.   0.4
  • D.   0.2
2. What is the mass of 0.100 moles of calcium hydroxide, Ca(OH)2?
  • A.   3.80g
  • B.   5.71g
  • C.   5.81g
  • D.   7.41g
3. How many hydrogen atoms are present in 0.10 mol of ethanol, C2H5OH?
  • A.   6.0 x 1022
  • B.   3.0 x 1023
  • C.   3.6 x 1023
  • D.   3.6 x 1021
4. Which of the following contains the greatest number of molecules?
  • A.   1.0g of CH4
  • B.   1.0g of CH3Cl
  • C.   1.0g of CH2Cl2
  • D.   1.0g of CHCl3
5. What is the approximate number of moles in 400g of methane, CH4?
  • A.   1.5 x 1025
  • B.   2.4 x 1026
  • C.   25
  • D.   6400
6. How many molecules are there approximately in a teaspoonful of water of mass 4.5g? teaspoon of water
  • A.   1.5 x 1023
  • B.   4.5 x 1023
  • C.   2.7 x 1024
  • D.   4.9 x 1025
7. 0.200 moles of a compound has a mass of 24.0g. What is the molar mass of the compound?
  • A.   4.80g mol-1
  • B.   48.0g mol-1
  • C.   120g mol-1
  • D.   240g mol-1
8. Which of the following contains the smallest number of atoms?
  • A.   1.2g of carbon
  • B.   1.8g of sodium
  • C.   2.4g of magnesium
  • D.   3.9g of potassium
9. How many atoms are present in 640g of methanol, CH3OH?
  • A.   20       
  • B.   120
  • C.   1.20 x 1025
  • D.   7.20 x 1025
10. How many ions are there in 2.0 moles of sodium sulfate, Na2SO4?
  • A.   8.4 x 1024
  • B.   3.6 x 1024
  • C.   1.2 x 1024
  • D.   3.0 x 1023