PREPWISER.
Practise online

Mole Concept & Stoichiometry formula sheet

Every formula in the Mole Concept & Stoichiometry chapter for JEE Main, with one line on when it applies. Topic 1 is open to everyone; sign in free to read all 25 and download the PDF.

Sign in to read all 25Download PDF

Read the first part free. Sign in free with Google to read the rest and download the PDF: 2 A4 pages.2 A4 pages, ready to print.

How we count: 7× asked means 7 past JEE Main questions in the PrepWiser bank needed that formula, and "last" is the latest year one appeared. ★ marks formulas asked 8 or more times.

Laws, units and significant figures

Laws of chemical combination
mass conserved; fixed mass ratiosimple whole-number ratios\begin{aligned}&\text{mass conserved};\ \text{fixed mass ratio}\\&\text{simple whole-number ratios}\end{aligned}
HX2O\ce{H2O} and HX2OX2\ce{H2O2}: 16 and 32 g O per 2 g H. Gases at same TT, PP: simple volume ratios.
Significant figures
2× asked, last 2025
0.0052→2,100→1,100.0→4,1.00×102→30.0052\to2,\quad 100\to1,\quad 100.0\to4,\quad 1.00\times10^2\to3
×,÷\times,\div: fewest sig. figs; +,−+,-: fewest decimal places. Exactly 5: round to even.

Practise Mole Concept & Stoichiometry questions as you read. Free, and you can start without signing up.

Practise Mole Concept & Stoichiometry

23 more formulas in 5 topics

Atomic mass, mole and molar volume; Percentage composition and formulae; Stoichiometry and limiting reagent; Yield, purity and mixtures; and Concentration terms. Read the first part free. Sign in free with Google to read the rest and download the PDF.

Sign in to read the restYou come straight back to this spot.Download the PDF

Atomic mass, mole and molar volume

  • Atomic mass unit; average mass1×
  • Mole11×
  • Molar mass from data7×
  • Molar volume of a gas19×

Percentage composition and formulae

  • Percentage composition5×
  • Empirical formula8×
  • Molecular formula7×
  • Combustion analysis8×

Stoichiometry and limiting reagent

  • Mole ratio25×
  • Combustion of a hydrocarbon13×
  • Gas volumes and pressures5×
  • Limiting reagent20×
  • Neutralisation14×
  • Group counting (organic)15×

Yield, purity and mixtures

  • Percentage yield6×
  • Purity3×
  • Mixtures3×

Concentration terms

  • Molarity14×
  • Molality4×
  • Mole fraction6×
  • Mass %, ppm6×
  • Conversions using density11×
  • Dilution and mixing5×

Practise Mole Concept & Stoichiometry next

About 190 past JEE Main questions from this chapter, with instant answer checking and step-by-step solutions where available. Free, and you can start without signing up.

Practise Mole Concept & Stoichiometry

Also free on PrepWiser

Spotted a mistake? Write to support@prepwiser.in and we will fix it in the next version.

Version 1, October 2026. Free to share for study, as it is. Please don't sell it or remove the PrepWiser name.

PractiseSign in to read all 25Download PDF
Free with Google, takes a few seconds2 pages, free