Question

Chem 143 - Lab 46) CALCULATE THE THEORETICAL YIELD Grams of sodium carbonate used Moles of sodium carbonate used Grams of calcium chloride used Moles of calcium chloride used Moles of precipitate expected Theoretical yield of precipitate in grams Actual yield of precipitate in grams Percent yield 5.6 Show detailed work for percent yield. Page 4 of 4

Answer 1

UVQOMUS - 1 Magnesem oxide , a white powdery subotance can as often be made by heating magnesium metal in presente 12 mg (s) + 02 (9) 2 mgo (s). This is the requiered chemical seaction b> 2mg (s) +02 (9) 2190 (s). 1000g 10.5 g = 10.10 ml 210th mul 201421 med. 20*328 mola here the limiting react and is Mg(8), as a mol of mg (8) reacts with 02 (8), so, aftoy ereacting of gryği mul mg 15), Oz Pemains 2 (6.328 -0.477 ) mee =001175 modo Theouitical yield of omgo (1) 10.6-421 mod. = (0.421X40) g yield obtained a lig g. 216.89g. Jo, percent yield of X100) % 270.66% 27 no. of moles of sodium carbonate [NO2 CO2, M. W.2100) no. of grams of Naz (oz eyed = (69.0640 -66.9790) 9. = 21085 g E No. of moles of Naz uz used 2 2085 mul 200019 mol- used:

3. No. of moles of calcium chloride [cally, M.Wallig mily no. of quams of calcium elloncide used 26691170 -67*062019 2210559. no. of mans of calcium chloride used & 2:055 g 11'1 g.molo = 0.018 mol. 4: The limiting Genetunt is calcium chlorvell, as it is present in less amount.