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CHM1011 - Chemistry I - S1 2025
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In the early morning when the temperature was 13.9 oC, a motorist measured her tyre pressure at 185 kPa. By noon the temperature in the tyres had reached 33.2 oC. What was the pressure (in kPa) in the tyres at noon assuming there was no change in volume?
Give your answer to three significant figures.
A student ended the experiment with 0.1400g of copper, having started with 0.2892g of CuCl2.2H2O.
Calculate the %yield of copper produced, i.e. the percentage recovery of copper compared to the expected amount.
(Hint: The reagents used are always in excess to the copper species (sodium hydroxide, sulfuric acid, and zinc). Hence, the copper species is always the limiting reagent. This means that the nCu=nCuCl2.2H2O at 100% yield.)
(Hint 2: If the copper produced was not adequately dried before weighing, then we may end up calculating a yield of >100%! Why is this?)
Calculations
Based on the experimental data provided, complete the following calculations.
A student ended the experiment with 0.1400g of copper, having started with 0.2892g of CuCl2.2H2O.
Calculate the moles of CuCl2.2H2O used: