HelpContactFor teachers and institutes
>_StemPy Lab
Mock TestsClasses

>_StemPy Lab

Learn. Solve. Code the solutions. Test yourself.

Live examsFree mock exams, timed and rankedEveryone starts together, and your score and rank come the moment it ends.See the exams →

Learn

  • Physics
  • Chemistry
  • Mathematics
  • Biology
  • Python Programming
  • Statistics & Data Science
  • Classes
  • Groups

Practice

  • Problems
  • Quizzes
  • Mock Tests
  • Prepare for an Exam
  • Question Sets
  • Exams
  • Certificates
  • Python Labs
  • AI Practice Generator
  • Student-Created Tests

Community

  • Discussions
  • Resources
  • Notes
  • Blog

Account

  • Log in
© 2026 senLearn. All rights reserved.HelpAboutContactPrivacy PolicyTerms of UseRefund Policy
  1. Problems
  2. /A glass slab measures 12.50 cm × 4.20 cm × 0.85 cm, and its mass is 111.6 g…
MediumChemistryHigh School (11–12)Atoms and Molecules › Measurement, Units and Significant FiguresNumericalBoard Exam

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

StemPy LabContributed by StemPy Lab

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 cm×4.20 cm×0.85 cm12.50\ \text{cm} \times 4.20\ \text{cm} \times 0.85\ \text{cm}12.50 cm×4.20 cm×0.85 cm, and its mass is 111.6 g111.6\ \text{g}111.6 g. Find its volume and its density, each with the right number of significant figures.

Check your answer

Work it out on paper, then type your number. The answer itself stays hidden.

cm³
g/cm³
Need a reminder? The key ideaShowHide

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.

Step 1. Volume. 12.50×4.20×0.85=44.625 cm312.50 \times 4.20 \times 0.85 = 44.625\ \text{cm}^312.50×4.20×0.85=44.625 cm3. The length 0.850.850.85 has 2 significant figures, so the volume is 45 cm345\ \text{cm}^345 cm3.

Step 2. Density. 111.6 g44.625 cm3=2.5008 g/cm3\dfrac{111.6\ \text{g}}{44.625\ \text{cm}^3} = 2.5008\ \text{g/cm}^344.625 cm3111.6 g​=2.5008 g/cm3. The volume limits us to 2 figures: 2.5 g/cm32.5\ \text{g/cm}^32.5 g/cm3.

Answer: 45 cm345\ \text{cm}^345 cm3 and 2.5 g/cm32.5\ \text{g/cm}^32.5 g/cm3.

Log in to save this for later
← All Problems
← Three students weigh three parts of a sample on three different balances: 25.341 g, 2.05 g and…A standard weight of exactly 4.000 g is weighed three times by three analysts… →
More onAtoms and Molecules › Measurement, Units and Significant Figures

Discussion (0)

Log in to join the discussion.

Loading…

Learn it in

  1. Measurement and uncertaintyMatter and Measurement

More on this topic

  1. A car goes 16 km on one litre of petrol…Easy
  2. Gold can be beaten into a very thin leaf…Hard
  3. A nurse must give 1.2 L of saline through a drip in 8.0 h…Medium
  4. A standard weight of exactly 4.000 g is weighed three times by three analysts…Medium
Three students weigh three parts of a sample on three different balances: 25.341 g, 2.05 g and…Medium
All problems on this topic →