2011 VCAA/sectionB/Q5

[VCE_2012]

How come the significant figures for each answer (VCAA examiners report) is different, In:
b) i (3 sig fig)
ii (4 sig fig)
iii (4 sig fig)

[aznxD]

In i) the value with the smallest number of sig figs used in calculation is 3 (0.0525M)
In ii) When adding or subtracting, you consider least number of decimal places not sig figs.
In iii) 4 sig figs as both the molar mass and mol of TeO2 is 4 sig figs.