Multiple Choice
Which statement about gases is most accurate?
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7. Gases
Gas Stoichiometry
Multiple Choice
Which of the following statements about the reaction of one mole of methane (CH_4) with oxygen at standard temperature and pressure (STP) is NOT correct?
A
The reaction of one mole of CH_4 with oxygen at STP produces one mole of CO_2.
B
The total volume of gaseous products at STP is 22.4 L.
C
The complete combustion of one mole of CH_4 produces two moles of H_2O.
D
The reaction requires two moles of O_2 for complete combustion.
Verified step by step guidance1
Write the balanced chemical equation for the complete combustion of methane (CH_4): \(\mathrm{CH_4 + 2\ O_2 \rightarrow CO_2 + 2\ H_2O}\).
Identify the mole ratios from the balanced equation: 1 mole of CH_4 reacts with 2 moles of O_2 to produce 1 mole of CO_2 and 2 moles of H_2O.
Recall that at STP (standard temperature and pressure), 1 mole of any ideal gas occupies 22.4 L. Use this to analyze the volumes of gaseous reactants and products.
Determine the total volume of gaseous products at STP: CO_2 is a gas, but H_2O produced in combustion is typically in the liquid phase under standard conditions, so only CO_2 contributes to the gaseous volume.
Compare the total volume of gaseous products to the volume of gaseous reactants to verify which statement about volume is NOT correct.
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