1.43 calculations involving masses

• concentration is measure of amount of substance that is dissolved in certain volume of solution
• concentration is measured in 


  g/dcm^3
• concentration(g/dcm^3) = mass of solute(g) / volume of solute(dcm^3)
• what is concentration of solution of 50g of potassium chloride dissolved in 0.5dcm^3

  100g/dcm^3
• less concentration is less solute dissolves in the solvent
• high concentration is more solute dissolved in volume of solvent
• mass of reactants at start = mass of products at end
• law of conservation of mass

  • no atoms are lost or made in chemical reaction only rearranged which means no mass is lost or made
• empirical formula gives the simplest whole number ratio of elements present in a compound
• molecular formula shows how many atoms of each element there are in one molecule