25°C in a cylinder fitted with a movable piston expañds against a constant external pressure of 1.00 atm. At equilibrium, the pressure and volume of the gas are 1.00 atm and 23.5 L, respectively. (a) Calculate the final temperature of the sample. (b) Calculate the values of q, w, and AU for the process. 3.14 An ideal gas is compressed isothermally from 2.0 atm and 2.0 L to 4.0 atm and 1.0 L. Calculate the values of Δ U and ΔΗ if the process is carried out (a) reversibly and (b) irreversibly. 5 3.15 Explain the energy changes at the molecular level when liquid acetone is converted to vapor at its boiling point. 3.16 A piece of potassium metal is added to water in a beaker. The reaction that takes place is 2K (s) + 2H20) 2KOH (aq) + H2(g) Predict the signs of w, q,AU, and ΔΗ. 3.17 At 373.15 K and 1 atm, the molar volume of liquid water and steam are 1.88 x 10-5 m3 and 3.06 10-2 m, respectively. Given that the heat of vaporization of water is 40.79 kJ mol-1, calculate and Δ U for l mole in the following the values of process: H20(4,373.15 K, 1 atm) H20(g, 373.15 K, 1 atm)

Macmillan Learning A solution of CaCl₂ in water forms a mixture that is 28.5% calcium chloride by mass. If the total mass of the mixture is 631.1 g, what masses of CaCl, and water were used? mass of CaCl₂: mass of water: g g

32. A lotion vehicle contains 15% v/v of glycerin (sp gr 1.25). How much glycerin should be used in preparing 5 gallons of the lotion? a. 2271 g glycerin b. 3339.7 mL glycerin c. 2671.8 g glycerin d. 3548.4 g glycerin

3. State how many significant figures are proper in the results of the following calculations. a. (106.7)(95.6)(46.210)(1.01)   b. (18.7)2   c. (16.0 ✕ 10−20)(3712)

Consider the reaction between solid scandium oxide and hydrogen chloride (HCl) gas to form solid scandium chloride and liquid water (the only cation that scandium [Z = 21] can form has a charge of +3).   How much scandium chloride (in grams) can be formed if 11.4 g of scandium oxide and 66.7 g of hydrogen chloride gas are placed in a reaction vessel? (3 sf)

DATA 1. Mass of empty beaker 2. Volume of NaCl solution 3. Mass of beaker and NaCl solution 4. Mass of beaker and dry NaCl CALCULATIONS (show all of your work) 5. Mass of NaCl solution (mass of beaker and NaCl solution - mass of beaker) 62. 249.79. 6. Mass of dry NaCl (mass of beaker and dry NaCl-mass of beaker) 55.29-49.79= 7. Mass percent of NaCl solution (mass of dry NaCl / mass of NaCl solution x 100) 5.59g/12.59 x 100 = O 12 49.7 10.0 62.2 55.2 12.5 5.59 8. Mass/volume percent of NaCl solution (mass of dry NaCl / volume of NaCl solution x 100) 5.59/10.69 x 100 = 55.9 44.72 55.9 ||| g mL g g g g % (m/m) % (m/v) O 11

A certain solution is 5.84 % by mass in calcium carbonate (CaCO3).  If the density of the solution is 1.02 g/mL, what mass (in grams) of calcium carbonate is contained in 46.4 mL of solution?  (3 sf)

I need help, I am stuck on this questions #1. A 20 ounce bottle of soda provides a total of 300. Calories. How many kilojoules are in the soda? (Hint: Bear in mind the correct number of significant figures your final answer should have.) #2. How many calories are absorbed when 75 g of ice melts? The heat of fusion for water is 80. cal/g . #3. 3.25 kcal is the same amount of energy as ________. (Hint: Bear in mind the correct number of significant figures your final answer should have.)