Post-UTME Chemistry 2015 Objective — Question 6
Question 6 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2015 Objective paper, with the correct answer and a full explanation.
Advertisement
CO(g) + 2H2(g) <=> CH3OH(g), delta H = -92 kJ mol-1. From the equation above, calculate the quantity of heat evolved when 6.4g of methanol is produced. [C=12, H=1, O=16]
- A. 92.0kj
- B. 46.0kj
- C. 18.4kjCorrect
- D. 9.2kj
Explanation
Molar mass CH3OH = 32g/mol. Moles = 6.4/32 = 0.2mol. Heat evolved = 0.2 x 92 = 18.4kJ.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.