Chemistry Calculators

 Below are links to some online chemistry calculators.

• Chemistry - moles and morality
• How many moles? - For a given amount of a substance with a known molecular weight, calculate the number of moles present. For example: "You have 3 g of a compound with a molecular weight of 30 g/mol. How many moles do you have?"
• What is the molarity of a solution? - For a given amount of a substance with a known molecular weight, calculate the molarity of a solution for a given volume. For example: "You have 5 g of a compound with a molecular weight of 50 g/mol, made up into a solution with a final volume of 100 mL. How is the molarity (concentration) of the solution?".
• How many grams to make a solution? - Calculate how many grams of substance you need to make a volume (millilitres (mL) or litres (L)) of a certain concentration (molar (M) or millimolar (mM)). For example: "You need to make 500 mL of a 1.25 M solution, and the compound has a molecular weight of 100 g/mL. How many grams of the compound do you need?"
• What is the final volume of a solution? - Calculate the final volume of a solution of a required concentration (molar (M) or millimolar (mM)) for a given amount of substance (grams (g)) with a known molecular weight. For example: "You have 5 g of a compound with a molecular weight of 50 g/mol, and you need to make a 0.5 M solution. What would be the final volume of the solution?".
• Chemistry - percentage solutions - percentage weight by volume (w/v) 
• The percentage weight by volume (w/v) of a solution - For a given number of grams of a substance made up to a specified final volume (in millilitres (mL) or litres (L)), what is the percentage weight by volume (w/v) of the solution? For example: "You have 2.5 g of a compound dissolved and made up to a final volume of 125 mL, what is the percentage weight by volume (w/v) of the solution?".
• The final volume of a percentage weight by volume (w/v) solution - For a given number of grams of a substance, and the required percentage weight by volume (w/v) of the solution required, what will be the volume in millilitres (mL) or litres (L) of the solution? For example: "You have 5 g of substance and wish to make a 7.5% weight by volume (w/v) solution. What will be the final volume of the solution?".