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Carbon forms two oxides, CO and CO<sub>2</sub>. For a fixed mass of carbon, the masses of oxygen that combine are in the simple whole-number ratio:

Answer: 1:2.

A 1:1
B 2:1
C 1:3
D 1:2

Correct answer: D. 1:2

Explanation: Per 12 g of carbon, CO has 16 g oxygen and CO<sub>2</sub> has 32 g oxygen; the ratio 16:32 = 1:2, illustrating the law of multiple proportions.

Mass connects to moles via molar mass, and moles connect to particle count via Avogadro's number or to gas volume via the 22.4 L/mol rule at STP.

Concept context

The mole is chemistry's counting unit. Learn to relate mass, volume, and number of particles using Avogadro's number and molar mass, the foundation of all stoichiometry and reaction calculations.

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Carbon forms two oxides, CO and CO<sub>2</sub>. For a fixed mass of carbon, the masses of oxygen that combine are in the simple whole-number ratio:

Concept context

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