How many moles of H 2 O are formed from 2 moles of H 2 in 2H 2 + O 2 -> 2H 2 O?

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How many moles of H2O are formed from 2 moles of H2 in 2H2 + O2 -> 2H2O?

Answer: 2 mol.

A 1 mol
B 2 mol
C 3 mol
D 4 mol

Correct answer: B. 2 mol

Explanation: The mole ratio H2:H2O is 2:2, so 2 moles of H2 form 2 moles of H2O.

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 H<sub>2</sub>O are formed from 2 moles of H<sub>2</sub> in 2H<sub>2</sub> + O<sub>2</sub> -> 2H<sub>2</sub>O?

Concept context

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