Question 10(Multiple Choice Worth 1 points) [CM.02] A student designed an experiment to show how water is recycled through the atmosphere. The steps of the experiment are shown below.
. Boil 500 mL of water in a beaker.
• Hold a hot glass plate a few inches above the beaker with a pair of tongs.
. Observe water droplets on the glass plate.
The student did not see water dripping off the glass plate as expected because the experiment had a flaw. Which of these statements best describes a
method to correct the flaw in this experiment?
Hold the glass plate closer to the beaker.
O Boil the water in a pan instead of a beaker.
Take more than 500 mL of water in the beaker,
O Use a cold glass plate instead of a hot glass plate.

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

bcde is the incorrect answer it is a