Enthalpy Stoichiometry

How much heat is absorbed if
4.0 mole A reacts?
A + 2B + 22.0 kJ → 3C  

• 22.0 kJ

• 44.0 kJ

• 66.0 kJ

• 88.0 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

The Equation for this reaction is:

• C + O₂ + 393 kJ→ CO₂

• C + O₂ → CO₂ + 393 kJ

• C + O₂ + 393 kJ→ CO

• C + O₂  + 110 kJ → CO

Tags

NGSS.HS-PS1-4

• 445 kJ

• 890 kJ

• 1780 kJ

• 3560 kJ

Tags

NGSS.HS-PS1-4

Define the term Exothermic by picking the correct statements

• Products have less energy than the reactants

• ΔH is negative

• ΔH is positive

• Energy is given out to the surroundings (temperature goes up).

• products have more energy than the reactants

Define Endothermic by picking the correct statements

• ΔH is positive

• Energy is taken in from the surroundings (temperature goes down).

• Energy is given out to the surroundings (temperature goes up).

• · Products have less energy than the reactants

• products have more energy than the reactants

Is this equation endo- or exo-thermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

When new chemical bonds form, energy ____________.

• is taken into the system.

• is released from the system.

• stays the same in the system.

Tags

NGSS.HS-PS1-4

Using the table of average bond energies below the image, the ΔH for the reaction in kJ is.....

• + 160 kJ

• -63 kJ

• - 160 kJ

• -217 kJ

Tags

NGSS.HS-PS1-4

What is the enthalpy change when 2 moles of hydrogen gas react with oxygen to form water, given that the enthalpy change for the reaction is -286 kJ/mol?

• -286 kJ

• -572 kJ

• -143 kJ

• 0 kJ

Tags

NGSS.HS-PS1-4

In an exothermic reaction, which of the following statements is true?

• The enthalpy of the products is greater than the enthalpy of the reactants.

• The enthalpy of the products is less than the enthalpy of the reactants.

• The enthalpy of the products is equal to the enthalpy of the reactants.

• The enthalpy change is positive.