Unit 1 (formula sheet):-

  1. (Unit 1.1) m (mass)=n (mole) x Mr (molar mass)

  2. (Unit 1.1) N (no. of particles)= Na (avogardos constant no.) x n (mole)

  3. (Unit 1.1) mole fraction of a gas = mole number of the gas/ total number of moles of the gas mixture

  4. (Unit 1.2) Avg. atomic mass= (mass of isotope x abundance %)+(“ “)+……

  5. (Unit 1.3) Mass %= mass of element/mass of compound x100%

  6. (Unit 1.4) (M) molarity= moles solute (n(mol))/Liter solution (L)

  7. (Unit 1.4) if given a percent without any masses then we should assume but we should make a suitable assumption (x is an element and xy is a compound) *mass (x) → mole (x) → mole (xy) → mass (xy) → % of (xy)

  8. (Unit 1.4) mass of element= mass of mixture x % of element/100