1. What is Mole Ratio in Stoichiometry?

The mole ratio is the ratio of moles of one substance to the moles of another substance in a chemical reaction. It's derived from the coefficients of a balanced chemical equation and is fundamental for stoichiometric calculations.

2. How Does the Calculator Work?

The calculator uses the mole ratio formula:

Where:

• \( n_A \) — Moles of substance A
• \( n_B \) — Moles of substance B

Explanation: The ratio represents how many moles of substance A are present per mole of substance B. This is dimensionless (unitless) quantity.

3. Importance of Mole Ratio

Details: Mole ratios are essential for:

• Determining reactant amounts needed for complete reaction
• Calculating theoretical yields
• Identifying limiting reagents
• Converting between amounts of different substances in a reaction

4. Using the Calculator

Tips: Enter the number of moles for both substances. Values must be positive numbers. The calculator will compute the ratio of A to B.

5. Frequently Asked Questions (FAQ)

Q1: How is mole ratio different from mass ratio?
A: Mole ratio compares substance amounts in moles (particle counts), while mass ratio compares their weights. Mole ratio is more useful for chemical reactions.

Q2: Can mole ratio be less than 1?
A: Yes, when there are fewer moles of substance A than substance B, the ratio will be less than 1.

Q3: How do I get moles from grams?
A: Use the formula: moles = mass (g) / molar mass (g/mol). You'll need to know the substance's molar mass.

Q4: Why is mole ratio unitless?
A: Because it's a ratio of two quantities with the same unit (moles), the units cancel out.

Q5: How is mole ratio used in limiting reagent problems?
A: Compare the actual mole ratio to the stoichiometric ratio from the balanced equation to determine which reactant limits the reaction.