#### Answer

d=m/v

#### Work Step by Step

This question is about sig figs within a density calculation. Since density=mass/volume, we know that division is involved. The rule for sig figs with division is that you round to the number of sig figs that the number with fewest sig figs has. For example, if you were dividing 10.25 (four sig figs) by 5.5 (two sig figs), you would round the answer to two sig figs. This specific question asks that if the mass is 104.72 g (which has 5 sig figs), how many sig figs will the density have, using the volume from 1.8a. in 1.8a, we found that the volume would have 2 sig figs, as 2.5 (the width) only has two sig figs. This means that the density will have two sig figs, as two is less than five.