Question

What is the relative formula mass (Mr) of a compound in which 1.4 moles equals 84g?

Answer 1

To find the relative formula mass (Mr) of a compound when given the number of moles and the mass, you can use the formula:

\[
\text{Relative formula mass (Mr)} = \frac{\text{mass (g)}}{\text{number of moles}}
\]

In this case, you're given:

- Mass = 84 g
- Number of moles = 1.4 moles

Now, plug the values into the formula:

\[
\text{Mr} = \frac{84 \, \text{g}}{1.4 \, \text{moles}} = 60 \, \text{g/mol}
\]

Thus, the relative formula mass (Mr) of the compound is **60 g/mol**.