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2. equation: 2NAOH + HCl
calculate the conc of sodium hydroxide, when it reacts with hydrochloric acid which has a conc of 0.125 mol/dm3, and a vol of 17.0cm3. the sodium hydroxide has a vol of 15.0cm3

  • 0.28
  • 0.283
  • 0.29
  • 0.280

3. If an atom contained 13 electrons, 15 neutrons and 13 protons, what would the mass number of the atom be?

  • 13
  • 2
  • 28
  • 26

4. calculate the relative formula mass of Ne3Na2(O2)3

  • 202
  • 202.6
  • 200
  • 203

5. A reaction has a theoretical yield of 6.3g. It has an actual yield of 2.6g. Calculate the percentage yield. (to 1 dp)

  • 41.3%
  • 41.4
  • 41
  • 41.2
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