Molar Concentration past formula use the same formula

Molar Concentration (past formula) use the same formula, but express it in moles per liter instead of grams per liter C = mass (g) Volume (L) C = n (moles) Volume (L)

C = mass (g) C = n (moles) Volume (L) C= g/L C= mol/L n (# of moles)= grams molar mass

If you need 4. 0 L of 0. 2 mol/L of sodium chloride solution (Na. Cl), what mass of sodium chloride must you use? Solve for the # of moles. C = n (moles) n (# of moles)= grams Volume (L) 0. 2 mol/L = n(moles) 4 n = 0. 8 mole The questions asks for the answer in grams NOT moles………. 5 L molar mass. 8 mol= grams 58. 5 g/L Na = 23 grams/mole Cl = 35. 5 grams/mole 58. 5 grams/mole g = 46. 8 grams

140 g of sodium hydroxide (Na. OH) are dissolved in water to form 4 L of a solution. WHAT IS THE MOLAR CONCENTRATION OF THIS SOLUTION? Convert grams into moles n (# of moles)= grams C = n (moles) molar mass Na = 23 grams/mole O = 16 grams/mole H = 1 gram/mole 40 grams/mole n = 140 g 40 g/mol n = 3. 5 moles Next, use your formula to solve for concentration in moles per litre. Volume (L) 5 L C = 3. 5 moles 4 L C = 0. 875 mole/L

¡ Be able to convert from grams to moles (or vice versa) n (# of moles)= grams molar mass ¡ Know the formula for concentration in moles per litre C = n (moles) Volume (L)

¡ WORKSHEET # 3