In the world of chemistry, stoichiometry can be a time-consuming and sometimes confusing unit to study. To help with your stoichiometry homework, here’s a brief overview of the topic and some links to useful and free calculators and problem solving programs.
What is Stoichiometry?
In a nutshell, it’s the process of determining how much input you need or output you’ll get for a given amount or quantity. In other words, it’s like working with any recipe in the kitchen. You need to be able to:
- convert between units (volume, mass, moles, sometimes atoms/molecules/particles)
- scale the chemical formula/equation (recipe) up or down
A few general rules of thumb include:
- convert moles to grams and grams to moles for a given molecule/substance/compound using its molar mass (also referred to as molar weight)
- convert molecules to moles (particles to moles) and vice versa using Avogadro’s number, 6.02 x 1023
- you can only convert between amount of input to output and vice versa with a BALANCED chemical equation.
STOICHIOMETRY CALCULATORS and PROBLEM SOLVERS ONLINE
Double check your stoichiometry homework with these problem solvers for chemistry! Find number of moles for a given mass of substance, grams for a given number of moles, moles or grams of product given moles or grams of reactant.
- User-friendly flash app, accepts and gives answers in decimal format only: https://sites.google.com/site/kehoesciencesims/home/stoichiometry-calculator
- Another flash based app, with the ability to accept/give answers in both decimal and scientific notation formats: