Question

c. How many moles of oxygen gas were produced? Round your answer to 4 sig figs. Question le Answer d. Calculate the experimental value for the gas constant R with units of L'atm/mol K. Round your answer to 4 sig figs. . 23L PV = nRT Question 1d Answer olzan o (2 mol 10.08. 2016 (29ct 2. While decomposing a KCIO, mixture, the experiment apparatus used to collect the oxygen gas sprang a leak. Would this error cause the following calculated values to be higher, lower, or the same as the true value? lower same a. The mass of O2 produced higher higher lower same b. The volume of O2 produced higher same lower C. The gas constant, R

Answer 1

The mass of original sample will be calculated as follows, mass of original sample=(mass of tube+sample before heating) – mass of ignition tube mass of original sample=50.7318 g -49.5102 g mass of original sample=1.2216g The mass of oxygen will be calculated as follows, mass of oxygen=(mass of tube+samplebeforeheating)-(mass of tube + sample after heating) mass of oxygen=50.7318g-50.4404g mass of oxygen=0.2914 g The moles of oxygen will be calculated as follows, given mass of oxygen moles of oxygen = molar mass of oxygen 0.2914g moles of oxygen=- 328 mol moles of oxygen = 9.106x10-' mol

d. In this part we are going to find the value of universal gas constant with the help of experimental values provided in the question. PV = nRT 11 x 297 K 6x10 1000 ml 230.46~10-’ atm· L = (2704.48x10-? mol·K)x R 230.46x10-' atm·L 2704.48x10-'mol · K L'atm R=0.08521 mol·K R =-