Which of the following experiments could you perform to investigate the effect temperature has on the volume of a gas?
A) Measure the volume of a balloon filled with room temperature air. Place the balloon in a freezer for an hour and then measure its volume again.
B) Measure the pressure of the air in a tire on a cold day, a warm day, and a hot day.
C) Inflate one balloon to a large volume and another balloon to a small volume. Measure the temperature of the air released from both balloons.

D) Stretch a balloon over the top of a beaker filled with baking soda and vinegar and observe how the balloon changes volume.

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g