Edexcel A-Level Chemistry A2 B 2 5 Logarithmic Quantities Topic Practice

An answer that makes reference to the following points:

- calculation of G

(1)

- units of G

(1)

Example of calculation:

G=-R T K_c=-8.31 x 620 x 4.46=-22979( J mol^-1) /-22.979( kJ mol^-1)

Accept -22980/-22.980 from use of (86.5) for 4.46

Accept use of 8.314 for R

Ignore SF except 1SF

Do not award omission of -ve sign

M2 dependent on use of R x T in M1

J mol^-1 (from 8.31 x 620 )

OR

kJ mol^-1 (from 8.31/1000 x 620 )

Calculation of G at any other temperature with correct units scores (1)