Answer to Question #309687 in Chemistry for mcc

Question

The standard enthalpy of a reaction can be ___________. 

a. calculated as the sum between the difference of the standard molar enthalpies of formation of products only.

b. calculated as the difference between the sum of the standard molar enthalpies of formation of reactants only.

c. obtained as the difference between the sum of the standard molar enthalpies of formation of products and reactants.

d. obtained from the different thermochemical equations by applying the first law of thermodynamics.

The amount of heat absorbed or released by a chemical reaction at constant atmospheric pressure. 

a. standard molar enthalpy

b. enthalpy of products

c. enthalpy of reaction

d. enthalpy

When heat flows from the system to its surroundings, heat is ________. 

a. equal

b. positive

c. negative

d. neutral

Answer 1

1.c. obtained as the difference between the sum of the standard molar enthalpies of formation of products and reactants.

2.c. enthalpy of reaction

3.c. negative