Enthalpy Change And Compounds Lab Report

Overview

The compound nonane, C9H20, is a good fuel. It is a liquid at ordinary temperatures. When the liquid is burned, the reaction involved is

C9H20(ℓ) + 14 O2(g)9 CO2(g) + 10 H2O(g)

The standard enthalpy of formation of liquid nonane at 25 °C is -274.7 kJ mol-1; other relevant enthalpy of formation values in kJ mol-1 are: C9H20(g) = -228.2 ; CO2(g) = -393.5 ; H2O(g) = -241.8

(a) Calculate the enthalpy change in the burning of 3.000 mol liquid nonane to form gaseous products at 25°C. State explicitly whether the reaction is endothermic or exothermic.

ΔH° = kJ

(b) Would more or less heat be evolved if gaseous nonane were burned under the same conditions?

What is the standard enthalpy change for vaporizing 3.000 mol C9H20() at 25°C?

ΔH° = kJ

Calculate the enthalpy change in the burning of 3.000 mol gaseous nonane to form gaseous products at 25°C.

ΔH° = kJ