Igcse Model Questions Vol1 2023 Chemistry Question 15
Practice objective / multiple choice question 15 from the 2023 Igcse Model Questions Vol1 Chemistry examination.
A 2.00 g sample of a substance (molar mass = 100 g·mol⁻¹) is heated at constant pressure from \(-20\)°C (solid) to \(80\)°C (gas). The substance melts at \(-5\)°C and boils at \(60\)°C. Its specific heat capacities are: solid 0.50 J·g⁻¹·K⁻¹, liquid 0.80 J·g⁻¹·K⁻¹, gas 0.60 J·g⁻¹·K⁻¹. The enthalpy of fusion is 25 kJ·mol⁻¹ and the enthalpy of vaporisation is 40 kJ·mol⁻¹. Calculate the total energy required for the whole heating process. Give your answer in kJ to three significant figures.
Answer Options
About This Question
This is Igcse Model Questions Vol1 2023 Chemistry Question 15. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.