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A dilute HCI solution is added to sodium carbonate in a closed flask (5.0 L). After the temperature equilibrates (T = 21°C) the pressure is measured (P = 550 mm Hg). What mass of sodium carbonate was in the flask? (The volume of acid is negligible but in excess, NazCO3 105.99 g/mol) (Hint: find the reaction of carbonate and acid).

A dilute HCI solution is added to sodium carbonate in a closed flask (5.0 L). After the temperature equilibrates (T = 21°C) the pressure is measured (P = 550 mm Hg). What mass of sodium carbonate was in the flask? (The volume of acid is negligible but in excess, NazCO3 105.99 g/mol) (Hint: find the reaction of carbonate and acid).

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Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Three please and if possible can you show units? Thanks!
Assume that all gases obey the Ideal Gas Law. Use separate paper. 1 A leak in a sealed room (T = 23°C) of a space station was observed when the pressure dropped 0.94 to 0.87 atm. a) What percentage of the air content was lost? b) The room is 3 m x 3 m x 5 m. What mass of air must be reintroduced in the room to restore the pressure after the leak has been repaired? (Air average MW = 28.97 g/mol) c) They wish to transport this air from earth in a 30.0L container that can withstand an internal pressure of 125 atm. What is the maximum temperature that this cylinder can be exposed to before it explodes? 2. a) A 2.00L flask is evacuated and weighted (224.573 g). It is filled with an unknown gas (weight = 227.274 g) and the internal pressure (P = 311 mm Hg) measured at 22.4°C. What is the molecular weight of the gas? b) Elemental analysis reveals that the gas contains only sulfur and oxygen. What is the formula of the gas (use your knowledge of atomic theory)? 3. A dilute HCI solution is added to sodium carbonate in a closed flask (5.0 L). After the temperature equilibrates (T = 21°C) the pressure is measured (P = 550 mm Hg). What mass of sodium carbonate was in the flask? (The volume of acid is negligible but in excess, NazCO3 105.99 g/mol) (Hint: find the reaction of carbonate and acid). 4. At the zoo, you witness a skunk uses its defence mechanism. There was no wind on that beautiful day (T = 25°C) and you were located 10 m from the animal. You detected the smell of the mercaptan (C,HgS, MW 88.16 g/mol) 133 sec later. What total distance did an average molecule of mercaptan travel before you detected it? (hint: careful with the units, see L29-3).
Transcribed Image Text:Assume that all gases obey the Ideal Gas Law. Use separate paper. 1 A leak in a sealed room (T = 23°C) of a space station was observed when the pressure dropped 0.94 to 0.87 atm. a) What percentage of the air content was lost? b) The room is 3 m x 3 m x 5 m. What mass of air must be reintroduced in the room to restore the pressure after the leak has been repaired? (Air average MW = 28.97 g/mol) c) They wish to transport this air from earth in a 30.0L container that can withstand an internal pressure of 125 atm. What is the maximum temperature that this cylinder can be exposed to before it explodes? 2. a) A 2.00L flask is evacuated and weighted (224.573 g). It is filled with an unknown gas (weight = 227.274 g) and the internal pressure (P = 311 mm Hg) measured at 22.4°C. What is the molecular weight of the gas? b) Elemental analysis reveals that the gas contains only sulfur and oxygen. What is the formula of the gas (use your knowledge of atomic theory)? 3. A dilute HCI solution is added to sodium carbonate in a closed flask (5.0 L). After the temperature equilibrates (T = 21°C) the pressure is measured (P = 550 mm Hg). What mass of sodium carbonate was in the flask? (The volume of acid is negligible but in excess, NazCO3 105.99 g/mol) (Hint: find the reaction of carbonate and acid). 4. At the zoo, you witness a skunk uses its defence mechanism. There was no wind on that beautiful day (T = 25°C) and you were located 10 m from the animal. You detected the smell of the mercaptan (C,HgS, MW 88.16 g/mol) 133 sec later. What total distance did an average molecule of mercaptan travel before you detected it? (hint: careful with the units, see L29-3).
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