Question

A chemistry student needs 80.0 mL of ethanolamine for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers thatthe density of ethanolamine is 1.02 g.cm. Calculate the mass of ethanolamine the student should welgh out.Be sure your answer has the correct number of significant digits.

Answer 1

STEP 1: Identify and Set Up

We are given a question that requires us to find mass when given volume and density.

It is common knowledge that these parameters are related by the formulae:

$\begin{gathered} \text{density = }\frac{\text{mass}}{\text{volume}} \\ \text{This gives mass = volume }\times\text{ density} \end{gathered}$

We use this relation to find mass

STEP 2: Execute

Density = 1.02 g/cc

Volume = 80ml = 80 cc

Mass is therefore:

$\text{mass = 1.02}\times80=81.6g$

Mass = 81.6g