Work out molarity before and after dilution, and the mass of solute involved.
Diluting from 100 mL to 750 mL is a 7.5-fold dilution, so molarity falls by the same factor while the moles of solute stay constant. The mass of solute is shown because that is what was originally weighed. Recording the dilution factor rather than just the final concentration makes a preparation traceable and reproducible.
Molarity Dilution
M₂ = M₁V₁ ÷ V₂; moles are conserved throughout
M₂ = M₁V₁ ÷ V₂; moles are conserved throughout Diluting from 100 mL to 750 mL is a 7.5-fold dilution, so molarity falls by the same factor while the moles of solute stay constant. The mass of solute is shown because that is what was originally weighed.
Recording the dilution factor rather than just the final concentration makes a preparation traceable and reproducible.
This calculator takes 4 inputs: Initial molarity, Initial volume, Final volume after dilution, Molar mass of the solute. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.