Free Printable Heats of Formation Quiz 2

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Heats of Formation Quiz 2

Total questions: 10

Worksheet time: 2hrs 37mins

Name

Class

Date

A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction. If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius. If the reaction is our system, is the system endothermic or exothermic?

Exothermic

Endothermic

Enthalpy is energy absorbed or relased during a chemical reaction as

light.

heat.

sound.

pressure.

In an endothermic reaction, the sum of the heats of formation of the products are____than the sum of the heats of formation of the reactants. Hint: is ΔH + or -? This about how you calculate ΔH

less than

greater than

equal to

Calculate the change in enthalpy $\Delta H$ for the following reaction:
$2CO\ +\ O_{2_{\ _{ }}^{ }}\longrightarrow\ 2CO_{2_{ }}$
Use your heats of formation table from your worksheet

-393.5 kJ/mol

-566.0 kJ/mol

566.0 kJ/mol

-369 kJ/mol

Which one of the following expressions is the correct way to calculate standard enthalpy change for the combustion of propane?

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)

Use your heats of formation table for reference.

[103.85 + (5 × 286)] – [-393.5 + -285.8]

[-103.85 + 0] + [(3 x -393.5) + (4 x -285.8)]

[-103.85 + 0] – [(3 x -393.5) + (4 x -285.8)]

[(3 x -393.5) + (4 x -285.8)] + [-103.85 + 0]

What is the heat of formation for 6 moles of ethanol? Use your heats of formation table for reference.

-1666.2 kJ/mol

-277.7 kJ/mol

52.3 kJ/mol

Only able to calculate in a reaction

Calculate $\Delta H$ using heats of formation for the combustion of methane:
$CH_4\left(g\right)\ +\ 2O_2\left(g\right)\ \rightarrow\ CO_2\left(g\right)\ +2H_2O\left(l\right)$
Use your heats of formation table for reference.

-890.25 kJ/mol

-604.45 kJ/mol

-754.15 kJ/mol

No way to tell

What is the difference between calculating $\Delta H$ with bond energies versus with heats of formation?

Bond energies are averages based on multiple scenarios of breaking bonds, heats of formation is the energy required to form a specific molecule from its elemental forms.

Heats of formation are averages based on multiple scenarios of breaking bonds, bond energies is the energy required to form a specific molecule from its elemental forms.

Bond energies are calculated using only lewis dot structures, but heats of formation requires a reference table

Heats of formation helps calculate enthalpy, while bond energies helps calculate entropy

What is the heat of formation for 8 moles of ammonia? Use your heats of formation table for reference.

-369.52 kJ/mol

-46.19 kJ/mol

-92.38 kJ/mol

-102.4 kJ/mol

10.

In an endothermic reaction, heat is ...

taken in or absorbed

given out or released

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Heats of Formation Quiz 2

Total questions: 10

Worksheet time: 2hrs 37mins

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