By Paul Yates

Basics optimistic and unfavorable Numbers priority in Equations Rearranging Equations Fractions Indices regular shape facing Uncertainty in Experimental options exhibiting Uncertainties within the size of Absorbance dimension in Chemistry Stoichiometric Calculations Uncertainty in size Thermodynamics Fractions and Indices within the Equilibrium consistent Bond Enthalpies The Born-Haber Cycle HeatRead more...

summary: basics confident and damaging Numbers priority in Equations Rearranging Equations Fractions Indices regular shape facing Uncertainty in Experimental thoughts showing Uncertainties within the dimension of Absorbance dimension in Chemistry Stoichiometric Calculations Uncertainty in dimension Thermodynamics Fractions and Indices within the Equilibrium consistent Bond Enthalpies The Born-Haber Cycle warmth means Clapeyron Equation Clausius-Clapeyron Equation the correct fuel Equation The Van der Waals Equation Equilibrium Constants resolution C

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05) cm3, respectively. What is the uncertainty in the titre? Chemical background Although it is probably more usual to refill a burette to the zero mark before starting each titration, there is an advantage to not doing this. Using a greater length of the burette will help to average out variations in the bore. It is important, however, to ensure that you do not run out of solution before the end point has been reached! 1% with a burette. 85 cm3 We begin by calculating the maximum possible uncertainty.

001 Å. 2 Statistics using a spreadsheet Although the formula for the calculation of standard deviation is straightforward to apply, this can be rather tedious if we have a large number of data, even if a calculator is used. indb 45 1/6/07 12:11:00 PM 46 Chemical calculations: Mathematics for chemistry, second edition one of the great features of computers, namely, that they are able to rapidly perform repetitive calculations. The most straightforward way to do this is to make use of the spreadsheet program found on most personal computers.

The Born–Haber cycle for sodium chloride allows its lattice enthalpy ∆L H to be calculated in terms of various other enthalpy changes. This leads to the equation 147 kJ mol−1 – (−639 kJ mol−1) = − (−493 kJ mol−1) – (−293 kJ mol−1) – (−∆L H) Calculate ∆L H from this equation. Coulomb’s law gives the potential energy V(r) in terms of the distance r between two point charges q1 and q2 as V (r ) = q1q2 4πε 0r where ε0 is a constant known as the permittivity of free space. Determine an expression for the potential energy V(r) between a nucleus with atomic number Z having charge Ze and an electron having charge –e.