An alloy of copper and aluminium is prepared from 65.6 g of Cu and 423.1 g of Al. Calculate the mass percent of each component in this solid solution.
Strategy: The mass precentage of a component of a solution is define as:
Mass% of a component
=`("Mass of the component in the solution")/("Total mass of the solution")xx100%`

Explanation

The data tell us that the total mass of the solution is 65.6 g of `Cu+423.1 g` of `Al=488.7 g` of solution and that there is `65.6 g` of Cu in the solution.
Therefore:
Mass percent of `Cu=(65.6 g Cu)/(488.7 g soln)xx100%`
`=13.4%`
Mass percent of `Al=(100%)-(13.4%)`
`=86.6%`