Multiple Choice
Which of the following statements is true regarding the enthalpy change of a reaction when the quantities of reactants are doubled?
8. Thermochemistry
Enthalpy of Formation
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Which of the following reactions represents the standard enthalpy of formation (ΔHₒƒ) for CsHSO4(s)?
A
Cs(s) + 1/2 H2(g) + S(s) + 2 O2(g) → CsHSO4(s)
B
Cs(s) + H2(g) + S(s) + 2 O2(g) → CsHSO4(s)
C
Cs+(aq) + H2O(l) + SO2(g) → CsHSO4(s)
Verified step by step guidance1
Understand the concept of standard enthalpy of formation (ΔHₒƒ), which is the change in enthalpy when one mole of a compound is formed from its elements in their standard states.
Identify the elements in their standard states: Cs(s) for cesium, H2(g) for hydrogen, S(s) for sulfur, and O2(g) for oxygen.
Recognize that the standard enthalpy of formation involves forming one mole of the compound, CsHSO4(s), from its elements in their standard states.
Examine the given reactions to determine which one forms CsHSO4(s) from its elements in their standard states. The correct reaction should have the reactants as Cs(s), 1/2 H2(g), S(s), and O2(g).
Verify that the stoichiometry of the reaction matches the formation of exactly one mole of CsHSO4(s) from the elements in their standard states, ensuring the coefficients are correct for the formation reaction.
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