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 n_Cu=n_CuCl2.2H2O 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: