Suppose I have enough ingredients to make 25 cookies, but when I go to bake them, I only get 5. What percent yield did I obtain?

Explanation:

What is the "theoretical yield" of cookies from each of the "reactants?"

Theor. yield from eggs

=

12

eggs

×

24 cookies

1

egg

=

288 cookies

Theor. yield from vanilla

=

24

tsp vanilla

×

24 cookies

1

tsp vanilla

=

576 cookies

Theor. yield from salt

=

82

tsp salt

×

24 cookies

0.5

tsp salt

=

3936 cookies

Theor. yield from baking soda

=

84

tsp baking soda

×

24 cookies

0.5

tsp baking soda

=

4032 cookies

Theor. yield from chocolate chips

=

3

cups chocolate chips

×

24 cookies

1.333

cups chocolate chips

=

54 cookies

Theor. yield from sugar

=

11

cups sugar

×

24 cookies

0.5

cup sugar

=

528 cookies

Theor. yield from brown sugar

=

4

cups brown sugar

×

24 cookies

0.5

cup brown sugar

=

192 cookies

Finally, "we leave it as an exercise for the student" to calculate that

Theor. yield from margarine = 72 cookies

b. Identify the limiting reactant

The limiting reactant is the amount of chocolate chips because they can produce the smallest amount of cookies.

c. Determine the theoretical yield

The theoretical yield is 54 cookies, because that is all you can get from the chocolate chips provided.

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"