Question:1 If an Alka-Seltzer tablet contained 300. mg of aspirin, 1.905 x 1003
ID: 915468 • Letter: Q
Question
Question:1 If an Alka-Seltzer tablet contained 300. mg of aspirin, 1.905 x 1003 mg of sodium hydrogen carbonate (also known as sodium bicarbonate), and 1.025 x 1003 mg of citric acid and nothing else, what is the percent, by mass, of sodium hydrogen carbonate in the tablet?
Question:2 Using the tablet information from Question 1, calculate the moles of CO2 you would theoretically expect from 0.202 grams of an Alka-Seltzer tablet at 715 torr and 292 K.
Question:3 You conduct an experiment where N2 is collected over water in a 1.03 L flask at 17oC. At the conclusion of the experiment, the total pressure in the flask is 568 torr. What is the pressure of N2 in the flask?
Question:4 A student reacted a sample of NaHCO3 with acid under the same conditions that will be used in lab. The total volume of gas collected plus the correction factor was 50.1 mL at a total pressure of 672 torr and 25oC. How many moles of CO2(g) were produced?
Explanation / Answer
There are too many questions ....four questions and each involves calculations so please post separately....
i am solving 1 and 2 only.....
1) Aspirin Formula: C9H8O4 Mass of aspirin = 300 mg
citric acid Formula: C6H8O7 mass of citric acid = 1025 mg
NaHCO3 Mass of NaHCO3 = 1905 mg
% of NaHCO3 = {(Mass of NaHCO3 ) / total mass of all sample} x100
= {(1905)/ (1025+1905+300) }x100 = 58.9 %
2) Assuming all the carbon is extracted from the tablet and converted to CO2
citric acid Molar mass: 192. 0 g/mol , aspirin Molecular mass: 180.0 g/mol
NaHCO3 Molar mass = 84g/mol
Millimoles of Carbon per tablet = 9 x 300/180 + 6 x 1025/192 + 1 x 1905/84
= 15 + 32 + 22.67 millimoles = 69.67 millimoles
Milimoles of CO2 formed = 69.67 millimoles
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