5. Aluminium reacts with oxygen to form aluminium 2Al(s) + 1½O2(g) = kJ mol−1 ΔH −1670 → What is the enthalpy of combustion of aluminium in kJ mol−1? A −835 B −1113 C −1670 D +1670 6. What is the relationship between a, b, c and d? A a = b + c d – B a = d b c C a = b c d D a = d + c b – – – – – 7. Given the equations then, according to Hess’s Law A c = a b B c = a + b C c = b a – – D c = b a. – – 8. What is the relationship between a, b, c and d? A a = c + d b − B a = b c d − − C a = c d −b − − D a = c + b + d
5. Aluminium reacts with oxygen to form aluminium 2Al(s) + 1½O2(g) → ΔH = −1670 kJ mol−1 What is the enthalpy of combustion of aluminium in kJ mol−1? A −835 B −1113 C −1670 D +1670 6. What is the relationship between a, b, c and d? A a = b + c – d B a = d – b – c C a = b – c – d D a = d + c – b 7. Given the equations then, according to Hess’s Law A c = a – b B c = a + b C c = b – a D c = – b – a. 8. What is the relationship between a, b, c and d? A a = c + d − b B a = b − c − d C a = −b − c − d D a = c + b + d
Unit-3-Exam-Level-Questions-1.docx