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

  • 41.4
  • 41.3%
  • 41.2
  • 41

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

  • 202
  • 202.6
  • 200
  • 203

4. Find the empirical formula, with 0.75g of calcium and 0.39g of sulfur.

  • Ca2S
  • CaS2
  • CaS
  • 2CaS

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

  • 28
  • 2
  • 26
  • 13
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