Question

DATA TABLE Trial# nal#2 A. Percent Yield of Na2C03 from Baking Soda 21.40 2!. 38 g mass of test tube + NaHCO3 g (before heating) mass of test tube 19.55 9.55 gg mass of NaHCO3 1.85 1-83 ge 20.55 20. 04 mass of test tube + Na2CO3 (after heating) 1.09 mass of Na2CO3 (actual yield) g Show the calculation for theoretical yield of Na2CO3 for trial. 1 (see Example Exercise 1) mass of Na2CO3 (theoretical yield) g Show the calculation for percent yield of Na2CO3 for trial 1 (see Example Exercise 1). Percent Yield of Na2CO3 Average Percent Yield % CCccccoO0000

Answer 1

The decomposition of Nape co es given as ? 2 NOHCO3 Eag Na, co, at the test con ugg This is a balanced chanical equation in which 2 moles of z Natco, Narc produces I nude of Na, o Nowo I mole Nanco, & molar mass of Na & nedlar nuass и + поlo 044 5, c + - nolar muass of Oz. & (23 + 1 + 12 & 18x3 g Natcom - 84 g Naft Oz I thas, a male Natcoz ? 2 x 849 = 168 g Nanco, similarly, I wole Nasco. = (20 23 + 12 + 1683) & Nazcoa = (20 23 + Na, com ? 106 g Nag co, So, 1689 Of Nor o produces 106g Na, Co2 mass of dan co, taken = 1.85g Trial 1 1: 85 g of was coz should produce 106 x 1.85 - = 1.167 g of NQ, CO2 им (6 8 yield so the 1.85 g therotiral or watcoz of Na, coz is 1.167 g when & taken in twal at any

trial a ! mass of Nosso A 1.83g. then, 1.83 g Nation should produce = 106 x 1.83 g Nado: = 1.154 g Nag 03 168 T Thus, the theoretical yield of Na, 2 is 1454 g - when 1.83 g of Nancoz was taken in trial 2. Calarations for percentage qield & 1 percentage yield = experimental prices x 1004: shearinca Trial 1: experimental theoretical yield = 1.00 g geld = 1.167 G o percenhage Yiel = 1.00 x 100% 1167 = 85.68% Trial 2 :- experimental yeld a 1-09g reoritical Yielope 1154 1 80 percentage Yield = 1.09 x T.154 100%. = 94. 45%

I thirs, and the percentage yield lor trial I is 84.087 the percentage percenta for trial 2 is 94.45%. Average percent yield = kercent yield in trial 1 e percent gield in trial 2) Now, 2 - 2 : Average percent yield = 85.68 + 94.45 - 90.06 % Thus, the average percent yield ů 90.06 %