Multiple Choice
A sample of gas has a volume of 32 L at 75°C. At what temperature (in °C) will the volume be equal to 16 L, assuming pressure and amount of gas remain constant?
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7. Gases
Gas Stoichiometry
Multiple Choice
When glucose (C6H12O6) is completely fermented according to the reaction C6H12O6 → 2 C2H5OH + 2 CO2, what volume of hydrogen gas (H2) at STP could be produced from 256 g of glucose?
A
22.4 L
B
11.2 L
C
0 L
D
44.8 L
Verified step by step guidance1
Identify the chemical reaction given: glucose (C6H12O6) is fermented to produce ethanol (C2H5OH) and carbon dioxide (CO2) according to the equation: \(\mathrm{C_6H_{12}O_6 \rightarrow 2\ C_2H_5OH + 2\ CO_2}\).
Note that hydrogen gas (H2) is not a product of this fermentation reaction. Therefore, no hydrogen gas is produced during this process.
Calculate the moles of glucose to confirm the amount of reactant: use the molar mass of glucose, which is approximately 180 g/mol, and calculate moles by \(n = \frac{\text{mass}}{\text{molar mass}}\).
Since the balanced equation does not include H2 as a product, the volume of hydrogen gas produced at STP is zero regardless of the amount of glucose fermented.
Conclude that the volume of hydrogen gas produced from 256 g of glucose under these conditions is 0 L.
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