Multiple Choice
Which of the following is the correct formation equation for SnO2(s) from its elements in their standard states?
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8. Thermochemistry
Formation Equations
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Which one of the following equations represents the formation reaction of CH3OH (l) from its elements in their standard states?
A
CO (g) + 2 H2 (g) → CH3OH (l)
B
CH4 (g) + 1/2 O2 (g) → CH3OH (l)
C
C (graphite) + 2 H2 (g) + 1/2 O2 (g) → CH3OH (l)
D
C (diamond) + 2 H2 (g) + O2 (g) → CH3OH (l)
Verified step by step guidance1
Understand that a formation reaction is defined as the reaction in which one mole of a compound is formed from its elements in their standard states under standard conditions (usually 1 atm and 25°C).
Identify the elements present in methanol (CH3OH): carbon (C), hydrogen (H2), and oxygen (O2).
Recall the standard states of these elements: carbon is most stable as graphite (not diamond), hydrogen is H2 gas, and oxygen is O2 gas.
Write the balanced chemical equation forming one mole of CH3OH from these elements in their standard states, ensuring the number of atoms on both sides matches.
Express the formation reaction as: \(\mathrm{C\ (graphite) + 2\ H_2\ (g) + \frac{1}{2} O_2\ (g) \rightarrow CH_3OH\ (l)}\).
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