This was until johannes kepler guessed that maybe the planets move around the sun, not in circular orbits, but in ellipses. this
was an idea that no one else had thought of, and when it was compared to recorded data, it proved to be correct.
what does this example illustrate about the process of science?
a.
science sometimes requires creativity.
b.
creative ideas are not very useful in science.
c.
mathematical theories always lead to scientific theories.
d.
guessing should have no place in modern science.

The answer to your question is 3 moles of AlCl₃

Explanation:

Process

1.- Write and balance the equation

                  Al(NO₃)₃ + 3NaCl   ⇒   3NaNO₃  +  AlCl₃

2.- Determine the limiting reactant

Theoretical proportion     1 mol Al(NO₃)₃ :  3 moles of NaCl                  

Experimental proportion   4 moles Al(NO₃)₃ : 9 moles NaCl

From these values, we determine that the limiting reactant is NaCl because the number of moles increases three times and the number of moles of Al(NO₃)₃  increases four times.

3.- Determine the amount of AlCl₃ using proportions

                       3 moles of NaCl 1 mol of AlCl₃

                       9 moles of NaCl  x

                       x = (9 x 1) / 3

                       x = 9 /3

                       x = 3 moles