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- 7. The figure shows a 50 kg lead cylindrical piston which floats on 0.68 mol of compressed air at 30°C. How far does the piston move if the temperature is increased to 300°C? 130 cm 250 cm 50 kg 1300 cm 120 cm 30°C 10 cm0.52 mol of argon gas is admitted to an evacuated 3.00 liter (3.00 × 10-3 m3) container at 20.0°C. The gas then undergoes an isobaric process to a temperature of 260°C. Which of the following is this process? 0→5 0→3 0→6 0→2 0→8 0→7 0→1 0→4Gas is confined in a tank at a pressure of 12.7 atm and a temperature of 24.0°C. If two-thirds of the gas is withdrawn and the temperature is raised to 67.0°C, what is the pressure of the gas remaining in the tank?
- Janice is grilling a steak for her July 4th barbecue dinner. The steak initially weighs 300 grams and is 25 mm thick. After grilling it for a while, she considers the steak done, and measures it again: it now weighs 215 grams, and is 15 mm thick. For both the cooked and uncooked steak, she uses the thumb-test to determine the done-ness, i.e. she uses her thumb (area ~5cm2) to push down with a force of 5 N. The uncooked steak compresses by 7 mm, and the cooked steak by 2 mm. The change in elasticity of the steak on cooking is due partly to the loss of water volume (so that existing bonds get closer together) and partly to the creation of new bonds. Assume all of the difference in raw vs. cooked steak thickness is due to water loss that makes it thinner (25 mm thick in the uncooked steak, versus 15 mm thick in the cooked steak), and that the other dimensions of the steak (length and width) have not changed. By what percentage has the steak's volume decreased from the original value?…275 mL of an aqueous solution containing 0.870 g of an unknown molecular compound generates an osmotic pressure of 2.52 atm at 20.0°C. What is the molar mass of the unknown compound? Group of answer choices 46.6 g/mol 171 g/mol 30.2 g/mol 23.3 g/mol 34.0 g/mol23If the mole fraction of n-pentane in a liquid mixture is 0.43, and its partial pressure (vapor pressure) above the liquid is 0.24 bars, what is the vapor pressure of pure n-pentane at the same temperature (in bars)? Assume it is an ideal solution. 0.0 0.24 1.79 0.56 0.103 OOOO
- What distinguishes solids, liquid and gases is that O atoms move fastest in gases, slower in liquids and are rigidly connected in solids atoms move fastest in solids, slower in liquids and they are rigidly connected in gases Othe temperature of gases is always higher the temperature of solids is higher because they have more energy QUESTION 9 Two atoms of the same element O always have the same number of neutrons and protons O always have the same number of protons but can have different numbers of neutrons O always have the same number of electrons and protons O(a) and (c) QUESTION 10 We know that atoms of different elements combine to form molecules of compounds like table salt and water. What makes these bonds possible is the number of protons the number of electrons the electric force that attracts electrons and protons the electric force that attracts the neutrons from two different atomsWhat is the ΔS° for the reaction? Given are the S°, in J K-1 mol-1, of each substance in parentheses. SiCl4 (g, 330.73) + 2 Mg (s, 32.68) → 2 MgCl2 (s, 89.62) + Si (s, 18.83) -198.02 J/K 198.02 J/K -254.96 J/K 254.96 J/KTwo rods, one made of brass and the other made of copper, are joined end to end. The length of the brass section is 0.200 m and the length of the copper section is 0.800 m. Each segment has cross-sectional area 0.00700 m^2. The free end of the brass segment is in boiling water and the free end of the copper segment is in an ice-water mixture, in both cases under normal atmospheric pressure. The sides of the rods are insulated so there is no heat loss to the surroundings. What mass of ice is melted in 6.00 min by the heat conducted by the composite rod?