Can anyone help me this question

Think about the lab procedure and what you know about types of mixtures.

a. Name one heterogeneous mixture present in this lab. ____________________

b. Name one homogeneous mixture present in this lab. ____________________

c. Name one pure substance present in this lab. ____________________

A student is given a 6.216 g mixture of iron filings, sodium chloride and sand. He separates the mixture and recovers 2.524 g of iron, 1.932 g of sand and 1.523 g of sodium chloride. Calculate the percentage of each component he recovered from the original mixture and the percent of material he lost during the separation process.

Percent of each component:

Mass lost during separation:

% lost