Equation Reader

Chemistry Area 3 SHOULD DO 2 • coefficients, subscripts & mole ratios

Read each balanced equation, then type the mole ratio and the amount in mol. Press Check; if anything is wrong, the worked solution appears. (Type a ratio like 1:3 or 1 to 3.)

Equations already balanced — READ them, do not balance

Equation 1

N₂ + 3H₂ → 2NH₃

Coefficients 1, 3, 2 • Atom check: L 2N + 6H · R 2×(1N+3H)=2N+6H — mass conserved.

Mole ratio N₂ : H₂?

2.00 mol N₂ reacts → mol NH₃ formed?

Mole ratio N₂:H₂ = 1:3 (1 mol N₂ : 3 mol H₂).
NH₃ = 2.00 mol N₂ × (2 mol NH₃ ⁄ 1 mol N₂) = 4.00 mol NH₃.

Equation 2

2H₂ + O₂ → 2H₂O

Coefficients 2, 1, 2 • Atom check: L 4H + 2O · R 4H + 2O — mass conserved.

Mole ratio H₂ : O₂?

6.00 mol O₂ reacts → mol H₂O formed?

Mole ratio H₂:O₂ = 2:1.
H₂O = 6.00 mol O₂ × (2 mol H₂O ⁄ 1 mol O₂) = 12.0 mol H₂O.

Equation 3

2Al + 3Cl₂ → 2AlCl₃

Coefficients 2, 3, 2 • Atom check: L 2Al + 6Cl · R 2×(1Al+3Cl)=2Al+6Cl — mass conserved.

Mole ratio Al : Cl₂?

2.00 mol Al reacts → mol Cl₂ needed?

Mole ratio Al:Cl₂ = 2:3.
Cl₂ = 2.00 mol Al × (3 mol Cl₂ ⁄ 2 mol Al) = 3.00 mol Cl₂.

Equation 4

CH₄ + 2O₂ → CO₂ + 2H₂O

Coefficients 1, 2, 1, 2 • Atom check: L C1, H4, O4 · R C1, H4, O4 — mass conserved.

Mole ratio CH₄ : O₂?

0.500 mol CH₄ burns → mol CO₂ formed?

Mole ratio CH₄:O₂ = 1:2.
CO₂ = 0.500 mol CH₄ × (1 mol CO₂ ⁄ 1 mol CH₄) = 0.500 mol CO₂.

Numbers with units are fine (e.g. 4.00 mol) — the checker reads the number.

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