Question 4 [2 marks] Methane (CH4) can burn in oxygen (O₂) to produce carbon dioxide (CO2) and water (H₂O) as outlined i

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Question 4 2 Marks Methane Ch4 Can Burn In Oxygen O To Produce Carbon Dioxide Co2 And Water H O As Outlined I 1 (419.36 KiB) Viewed 60 times

Question 4 [2 marks] Methane (CH4) can burn in oxygen (O₂) to produce carbon dioxide (CO2) and water (H₂O) as outlined in the following equation: CH4 (g) +202 (g) CO2 (g) + 2H₂O Calculate the standard enthalpy change associated with this reaction at 25 °C using the following enthalpies of formation: CH4 AH = -62.7 kJ.mol-¹, CO2 AH = -393.5 kJ.mol-1, H₂O AH = -285.8 kJ.mol-¹. Question 5 [5 marks] Titration reactions allow accurate determination of the concentrations of basic solutions when reacted with acidic solutions of known concentrations. [2 marks] (i) Describe how you would prepare 150 mL of 0.20 M H₂SO4 using 1.0 M H2SO4. [2 marks] For the case where 31.60 mL of 0.20 M sulfuric acid solution (H2SO4) are required to neutralise 25.00 mL of a sodium hydroxide (NaOH) answer the following questions. (ii) (iii) What is the concentration of sodium hydroxide in the original solution? Include a balanced equation for the reaction. Would you expect the final solution to be acidic, basic or neutral? [2 marks] [1 mark]