EasyChemistryHigh School (11–12)Atoms and Molecules › Measurement, Units and Significant FiguresNumericalBoard Exam
A car goes 16 km on one litre of petrol…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A car goes on one litre of petrol. A trip is long, and petrol has a density of . How many litres of petrol does the trip use, and what is their mass?
Need a reminder? The key ideaShow
A conversion factor is a fraction equal to one, such as . Choose it so that the unwanted unit cancels. For squared or cubed units, square or cube the factor.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Volume. .
Step 2. Mass. , which is to 2 significant figures.
Answer: , with a mass of about .
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