Question

A chemist weighed out 5.4 g of aluminum. Calculate the number of moles of aluminum she weighed out.

Be sure your answer has the correct number of significant digits.
mol

Answer 1

The chemist weighed out 0.2 moles of aluminum.

To calculate the number of moles of aluminum, we need to use the formula:

moles = mass / molar mass

The molar mass of aluminum is 27 g/mol. Therefore, the number of moles of aluminum in 5.4 g can be calculated as:

moles = 5.4 g / 27 g/mol = 0.2 (mol)

So the chemist weighed out 0.2 moles of aluminum.

It is important to note that the number of moles should have the same number of significant digits as the mass measured.