Chapter 5 2022/2023

a) A sample of zinc metal reacts completely with hydrochloric acid as shown in the equation below:

  Zn (s) + 2 HCl (aq) → ZnCl2 (aq) + H­2 (g)

 The hydrogen gas produced is collected by water displacement 25oC. The volume of gas is 7.80 L and the pressure is 0.980 atm. Calculate the amount of zinc metal (in grams) consumed in the reaction if the pressure of water at 25oC is 0.0313 atm. 

[4 Marks]    

i. Sketch a labelled phase diagram of pure water. Draw a line to indicate the boiling point of pure water.   

[3 Marks] 

ii. Determine whether water or ice is denser. Explain your answer.    

[2 Marks]