Lab Report Form, Data, and Participation (19 pts) Room Temperature (n oC Baromet
ID: 635943 • Letter: L
Question
Lab Report Form, Data, and Participation (19 pts) Room Temperature (n oC Barometric Pressure (P) Part A - Molar Mass of CO2 Mass of flask +stopper+ air68 offlask + stopper + CO2 gas (after subliming?2.69 -g Volume water in flask (-volume of gas), V pl. a mL Part B-Production of CO2 from Baking Soda Part C-Production of CO2 from Baking Powder Mass of Baking Powder 4.27- g Mass of Baking Sodo04 9 Volume (mL) Time (min) Volume (mL) Time (min) 12 15 2-2 15 15 Volume occupied by CO2 gas VIS min- Vo min Volume occupied by CO2 gas
Explanation / Answer
Q.1: Temperature in Kelvin = 18 + 273 = 291 K
Pressure in atm = 650.716 / 760 = 0.856205 atm
Molar mass of CO2 from periodic table = 44.01 g/mol
Molar mass of NaHCO3 from periodic table = 84.0066 g/mol
Q.2: Part-A Calculation:
Volume of air = 57 mL = 0.057 L
Number of moles of air in flask,
n = PV/RT = 0.856205 atm * 0.057 L / (0.0821 L.atm.mol^-1.K^-1 *291 K) = 0.0020428 mol
(b): Mass of air in the flask = 0.0020428 mol * 29.0 g/mol = 0.059240 g
(c): Mass of flask and stopper = 42.64 g - 0.059240 g = 42.58 g
(d): Mass of CO2 in the flask = 42.69 g - 42.58076 g = 0.10924 g
(e): Experimental molar mass of CO2 = mass of CO2 / moles of CO2
0.10924g / 0.0020428 mol = 53.5 g/mol
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