MediumChemistryHigh School (11–12)Atoms and Molecules › Measurement, Units and Significant FiguresNumerical

A glass slab measures 12.50 cm × 4.20 cm × 0.85 cm, and its mass is 111.6 g.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

A glass slab measures $12.50\ \text{cm} \times 4.20\ \text{cm} \times 0.85\ \text{cm}$ , and its mass is $111.6\ \text{g}$ . Find its volume and its density, each with the right number of significant figures.

Need a reminder? The key ideaShow

Non-zero digits are significant. Zeros between them are significant. Zeros at the left are not. Zeros at the right count only after a decimal point. Sums keep the fewest decimal places; products keep the fewest significant figures.

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.

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