Practise Edexcel IAL Chemistry 7.2.1 by choosing sensible precision from measured data and reporting calculated masses to two or three significant figures.
The total mass of the bottle is 80.0 kg when it is full of oxygen.
Calculate the mass of an empty bottle, using your working from (c)(i).
Give your answer to an appropriate number of significant figures.
mass of bottle stated to 2 or 3SF
Example of calculation:
80.0-15.846=64.154=64 / 64.2( kg)
Allow answers in grams to 2 or 3SF
TE on mass calculated in (c)(i) provided it gives a positive mass
If no mass calculated in kg (c)(i) then allow the subtraction of a mass calculated in (c)(ii) if answer is positive and given to 2 or 3SF