Hello!
To find the density of an object, you need to divide mass over volume. This is shown as: d = m/V, where d is the density, m is the mass, and V is the volume.
We are given the mass to be 126.7 grams, and the volume is 70.0 cubic centimeters.
If we rounding to the nearest significant figure, then there will be 3 significant figures in this problem because the number "70.0" has a zero to the right of the decimal place, so we include all of these place values to be a significant figure.
126.7 grams / 70.0 cubic centimeters = 1.81 g/cm³
Our number has three significant figures, so we do not need to round to the number of significant figures.
Therefore, the density of this object is 1.81 g/cm³.
