Question

Single Replacement Question 18 1 pts **Show your work on scratch paper A student performed the stoichiometry lab' and investigated the decomposition of sodium bicarbonate by heating a sample of sodium bicarbonate in a crucible. They began the lab with a 4.234 gram sample of sodium bicarbonate. If the student assumed that the below! reaction that took place (producing sodium carbonate), what would be the theoretical yield of sodium carbonate? 2 NaHCO3(s) Na2CO3(s) + CO2(g) + H2O (8) 5.342 grams 2671 grams 1336 grams 4234 grams Question 19 After heating the crucible in the above problem (Question 18 the student only isolated 0.9612 grami ofroduct. What should conclude?

Answer 1

According to the equation, 2 moles of NaHCO3 decomposes to form 1 mole of Na2CO3

Number of moles of NaHCO3 taken = mass/molar mass of NaHCO3 = 4.234/84.007 = 0.0504 moles

So, the number of moles of Na2CO3 should be produced = 0.0504/2 = 0.0252 moles

So, the theoretical yield of Na2CO3 = the number of moles * molar mass = 0.0252*105.988 = 2.671 g