Question 1

What is stoichiometry?

Accepted Answer

Stoichiometry is the quantitative relationship between reactants and products in a balanced chemical equation. It uses mole ratios (the coefficients in the balanced equation) to convert between amounts of different substances.

Question 2

How do I find the mole ratio?

Accepted Answer

The mole ratio comes from the coefficients in the balanced equation. For example, in 2H₂ + O₂ → 2H₂O, the mole ratio of H₂ to O₂ is 2:1, and H₂ to H₂O is 2:2 (or 1:1).

Question 3

Why do I need a balanced equation?

Accepted Answer

A balanced equation ensures the law of conservation of mass is satisfied. Without it, the mole ratios would be incorrect, leading to wrong calculations of how much product is formed or reactant is needed.

Question 4

How do I convert grams to moles?

Accepted Answer

Divide the mass in grams by the molar mass (g/mol) of the substance. For example, 36 g of water / 18.015 g/mol = 2.0 mol of water.

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