How many moles of tin atoms are in a pure tin cup with a
mass of 38.1 g?

0.32mole

Explanation:

Given parameters:

  Mass of tin cup  = 38.1g

Unknown:

Number of moles in the cup  = ?

Solution:

To find the number of moles, use the expression below;

 Number of moles  =

Molar mass  = 118.7g/mol

  So;

 Insert the parameters and solve;

Number of moles  =   = 0.32mole

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

explanation: