Lesson: Rounding to Significant Figures Chemistry
In this lesson, we will learn how to express the precision of a value by rounding to the correct number of significant figures or decimal places.
The mass of a substance can be calculated by multiplying its density by its volume. A chemist wants to calculate the mass of a sample of gold with a volume of 3.5 cm3. The density of gold is 19.32 g/cm3.
To how many significant figures should the mass be given?
What is the mass of the sample?
1 g of sodium consists of 0.04349717268 moles.
What is this number of moles to 3 decimal places?
What is this number of moles to 3 significant figures?
To how many significant figures is the value 0.0023 kg given?