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Chemistry /
Thermo Chemistry /
2026 /
Quiz 7

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MDCAT Practice Test - Practice Test - Chemistry - Thermo Chemistry - 2026 Quiz

Attempt 10 MCQs on MDCAT Practice Test - Practice Test - Chemistry - Thermo Chemistry (Year 2026) | Quiz 7

61. Calculate ΔH for formation of ethene from elements.

+52.4 kJ
-52.4 kJ
-1411 kJ
+1411 kJ

62. Which law is Hess's law a consequence of?

First law
Second law
Third law
Zeroth law

63. Calculate ΔH_f° of CH4 from combustion data.

-75.1 kJ/mol
-890 kJ/mol
+75.1 kJ/mol
-393.5 kJ/mol

64. How is ΔH estimated from bond energies?

Bonds broken minus bonds formed
Bonds formed minus bonds broken
Sum of bond energies only
Difference in bond energies

65. Calculate ΔH for H2 + Cl2 -> 2HCl using bond energies.

-183 kJ/mol
-183 kJ
+183 kJ
-431 kJ

66. What is the ΔH_f° for O2(g)?

Zero
Positive
Negative
Variable

67. Which cycle uses Hess's law to determine lattice energy?

Born-Haber cycle
Haber process
Ostwald process
Contact process

68. Which expression is correct for ΔH°_rxn?

Σ n ΔH_f°(products) - Σ n ΔH_f°(reactants)
Σ n ΔH_f°(reactants) - Σ n ΔH_f°(products)
Σ n ΔH_f°(products) + Σ n ΔH_f°(reactants)
n ΔH_f°(products) only

69. Calculate ΔH for ammonia synthesis given ΔH_f°(NH3) = -46 kJ/mol.

-92 kJ/mol
-46 kJ/mol
+92 kJ/mol
0 kJ/mol

70. Why does Hess's law work?

Enthalpy is a state function
Enthalpy is a path function
Entropy is a state function
Internal energy is path function

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