How many moles of O 2 are needed to burn 2 moles of CH 4 in CH 4 + 2O 2 -> CO 2 + 2H 2 O?

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How many moles of O2 are needed to burn 2 moles of CH4 in CH4 + 2O2 -> CO2 + 2H2O?

Answer: 4 mol.

A 1 mol
B 2 mol
C 4 mol
D 6 mol

Correct answer: C. 4 mol

Explanation: The ratio CH4:O2 is 1:2. For 2 moles CH4, oxygen needed = 4 moles.

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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How many moles of O<sub>2</sub> are needed to burn 2 moles of CH<sub>4</sub> in CH<sub>4</sub> + 2O<sub>2</sub> -> CO<sub>2</sub> + 2H<sub>2</sub>O?

Concept context

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