Exam Questions for CfE Higher Chemistry. Unit 1 Chemical Changes and Structure. 1.1 Controlling the Rate. The graph shows the variation of concentration of a reactant with time as …

This endothermic reaction has an activation energy of 167 kJ mol–1 and the heat of reaction, (H, is +28 kJ mol–1. What is the activation energy for the reverse reaction, the decomposition of …

Mar 22, 2019 · kJ/mol Both CsF and LiF crystallize in the Rock Salt (NaCl) structure. The Standard Enthalpy of formation of CsF is -554kJ/mol and that of LiF is -617 kJ/mole.

First, sort the elements into groups according to similar chemical properties (hydride, oxide, chloride). Make each group as specific as possible. Try a few different methods and choose …

Using your answers above and the information below, find the standard heat of formation of CO2(g) at 25 C.. ΔHsublimation (graphite) = 715 kJ/mol ΔH(O=O) = 498 kJ/mol . You …

C(s) + O2(g) → CO2(g), ΔHf = -393.5 kJ/mol This gives us the CO2 we need on the product side and one of the O2 moles we need on the reactant side. To get two more O2 moles, use the …

Know that to determine unknowns, often you are trying to find g/mol. Question 6: Appears to be usually on atomic structure and/or trends (especially trends based on IMF’s such as …

The molar enthalpy of fusion of water is 6.03 kJ/mol at 273K and the molar heat capacities of liquid water and ice are 75.3 J/mol·K and 37.9 J/mol·K. Consider the process…

Using Hess’s Law, H = +178 kJ/mol. For 1.00 g of CaCO3, H = +1.78 kJ. 41 a) C4H10 (l) + 13/2 O2 (g) ( 4CO2 (g) + 5H2O + 2658.3 kJ. b) Using Hess’s Law, Hf = -124.7 kJ. 45) 71.0 g ethyl …

0.027 mol/L. 0.000057 g. PbBr. 2. 367.01 g/mol. 0.1 mol/L. 0.000367 g. PEABr (phenylethylammonium bromide) 202.09 g/mol. 0.067 mol/L. 0.000135 g. EABr …