Multiple Choice
Combustion analysis of 63.8 mg of a compound containing carbon, hydrogen, and oxygen produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?
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3. Chemical Reactions
Combustion Analysis
Multiple Choice
Which of the following processes produces carbon dioxide gas?
A
Combustion of methane
B
Photosynthesis in plants
C
Dissolution of sodium chloride in water
D
Electrolysis of water
Verified step by step guidance1
Identify the chemical reactions involved in each process: Combustion of methane, Photosynthesis in plants, Dissolution of sodium chloride in water, and Electrolysis of water.
For combustion of methane, write the balanced chemical equation: \( \text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O} \). Notice that carbon dioxide (\( \text{CO}_2 \)) is a product.
For photosynthesis, write the general equation: \( 6\text{CO}_2 + 6\text{H}_2\text{O} + ext{light energy} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \). Here, carbon dioxide is a reactant, not a product.
For dissolution of sodium chloride in water, write the equation: \( \text{NaCl}_{(s)} \rightarrow \text{Na}^+_{(aq)} + \text{Cl}^-_{(aq)} \). This process does not involve carbon dioxide.
For electrolysis of water, write the equation: \( 2\text{H}_2\text{O} \rightarrow 2\text{H}_2 + \text{O}_2 \). This process does not produce carbon dioxide.
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