Reactant Chemistry Example 3

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Example 3

medium
In the combustion of propane, C3H8+5O2→3CO2+4H2O\text{C}_3\text{H}_8 + 5\text{O}_2 \rightarrow 3\text{CO}_2 + 4\text{H}_2\text{O}, how many moles of O2\text{O}_2 are needed to react completely with 22 moles of C3H8\text{C}_3\text{H}_8?

Solution

  1. 1
    From the balanced equation, 1 mole of C3H8\text{C}_3\text{H}_8 requires 5 moles of O2\text{O}_2.
  2. 2
    For 2 moles of C3H8\text{C}_3\text{H}_8: 2×5=102 \times 5 = 10 moles of O2\text{O}_2 are required.

Answer

10 moles of O210\text{ moles of O}_2
The stoichiometric coefficients in a balanced equation directly give the mole ratios between reactants. Scaling up one reactant requires proportionally scaling all others.

About Reactant

A starting substance that is consumed and chemically transformed during a chemical reaction, appearing on the left side of a chemical equation before the reaction.

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More Reactant Examples

Example 1 easy

Define the term 'reactant' in a chemical reaction. In the reaction [formula], identify all reactants

Example 2 medium

In the reaction [formula], identify the reactants and determine the mole ratio in which they react.

Example 4 hard

A student mixes [formula] g of sodium ([formula]) with excess water. The reaction is: [formula]. Cal

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