# Chemistry

The following questions concern the iconic Nestle Toll House Chocolate Chip Cookie recipe, shown below:

2 1/4 cups all-purpose flour

1 teaspoon baking soda

1 teaspoon salt

1 cup butter or margarine, softened

3/4 cup granulated sugar

3/4 cup packed brown sugar

1 teaspoon vanilla extract

2 large egg

1 (12 ounce) package NESTLE® TOLL HOUSE® Semi-Sweet Chocolate Morsels

1 cup chopped nuts

1)Baking soda consists mostly of a single chemical. Look up what it is, its molecular weight and density, and determine the number of moles used in this recipe.

2)Granulated sugar consists mostly of a single chemical. Look up what it is, its molecular weight and density, and determine the number of moles used in this recipe.

3)Table salt consists mostly of a single chemical. Look up what it is, its molecular weight and density, and determine the number of moles used in this recipe.

4)Glutenin (molecular weight: 75,000amu) makes up ~60% of the protein in all-purpose flour. About how many molcules of glutenin are in this recipe?

1. 👍 1
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3. 👁 1,259
1. 1. Sodium bicarbonate (newer name is sodium hydrogen carbonate) NaHCO3. # mols = grams/molar mass.

2. sucrose. You can look up the other items.

3. NaCl. You can look up the other items.

4. 75,000 grams will contain 6.02E23 molecules.

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2. 👎 3
2. Can you show me the solution and result please?

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3. Can you answer this question in the number?

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4. #4 is actually 1.5E20

We know the density of flour is ρflour = 100 g/ 170 mL = .59 g/mL. To find the mass of flour, mflour we can multiply ρflour by the total volume of flour, Vflour:

Vflour=2.25 cups⋅237 ml/cup=533 mL
mflour=ρflour⋅Vflour=59 g/mL⋅533 mL=314 g
Now that we have the mflour, we can find the mass of the glutenin, mglutenin, since we know that flour is 60% glutenin by mass:

mglutenin=mflour⋅10 g protein100 g flour⋅60 g glutenin100 g protein=18.84 g glutenin
We can divide mglutenin by its molecular weight, mwglutenin = 75,000 g/mol to find the moles. To find the number of molecules we can multiply the moles by Avogadro's number, NA = 6.022 ⋅ 1023 molecules/mole.

Molecules of glutenin: =mglutenin75,000 g/mol⋅6.022⋅1023 molecules/mol=1.5⋅1020 molecules

1. 👍 5
2. 👎 0
5. The following questions concern the iconic Nestle Toll House Chocolate Chip Cookie recipe, shown below:

2 1/4 cups all-purpose flour

1 teaspoon baking soda

1 teaspoon salt

1 cup butter or margarine, softened

3/4 cup granulated sugar

3/4 cup packed brown sugar

1 teaspoon vanilla extract

2 large egg

1 (12 ounce) package NESTLE® TOLL HOUSE® Semi-Sweet Chocolate Morsels

1 cup chopped nuts

1)Baking soda consists mostly of a single chemical. Look up what it is, its molecular weight and density, and determine the number of moles used in this recipe.

2)Granulated sugar consists mostly of a single chemical. Look up what it is, its molecular weight and density, and determine the number of moles used in this recipe.

3)Table salt consists mostly of a single chemical. Look up what it is, its molecular weight and density, and determine the number of moles used in this recipe.

1. 👍 0
2. 👎 0

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