Hang my brother brithday is coming and my parent need to know how to make a chocolate cake? btw im putting chemistry cause i dont see science

Answer

3 cups all-purpose flour

2 cups sugar

1/3 cup baking cocoa

2 teaspoons baking soda

1 teaspoon salt

2 cups water

3/4 cup vegetable oil

2 teaspoons vanilla extract

2 teaspoons white vinegar

CHOCOLATE CREAM CHEESE FROSTING:

3 ounces cream cheese, softened

1/4 cup butter, softened

2 cups confectioners' sugar

1/3 cup baking cocoa

Dash salt

3 tablespoons 2% milk

1/2 teaspoon vanilla extract

Explanation:

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.