Question

Cooking gas cylinders contain 92% butane (C4H10). Consider the following reaction.
C4H10(g) + mc022-1.jpgO2(g) ® 4CO2 + 5H2O(mc022-2.jpg ) DcH0 = –2655.0 kJ/mol

Which of the following statements are false?
Question 22 options:

when one mole of C4H10 is burned, four moles of CO2 are produced

when one mole of C4H10 is burned, 2655 kJ of energy are released

when one mole of C4H10 is burned, ten moles of H2O are produced

the reaction is endothermic

the reaction is a combustion

Answer 1

False are:

- "when one mole of C4H10 is burned, ten moles of H2O are produced" — the equation shows 5 H2O per mole C4H10, not 10.

- "the reaction is endothermic" — ΔH° = −2655.0 kJ/mol, so the reaction is exothermic (energy is released).