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This Tetris ice cube game is available to play as long as the ice cubes remain ice. The game pieces weigh 178 g, and the heat capacity of the room air, is 1.006 kJ/kg-oC, and the DH fusion (water) = 333.55 kJ/kg. (a) How much energy will the game pieces absorb as they are
converted to water @ 0oC? (b) If the game pieces are kept in a Styrofoam box that is 1 l in size, and a temperature of 25oC, will the game pieces melt completely? Assume no heat transfer to or from the room air room that is outside the box, or to material in the box. (c) What is the final temperature of the air in the box? (d) if the box were filled with Ar gas, would the ice pieces melt faster or slower (heat capacity of Ar = 20.8 J/mol-K, or .52 J/g-K, and the density Ar = 1.784 g/ml @ 0oC)
What is the vapor pressure of a solution which contains 0.550 moles of acetonitrile and 0.350 moles of acetone? Assume the mixture behaves as an ideal solution.
A sample of nitrogen gas in a 4.4-L container at a temperature of 35°C exerts a pressure of 3.7 atm. Calculate the number of moles of gas in the sample.
What are the relative populations of these levels at the boiling if the degeneracy level is 2j+ 1? Is the ground state most highly populated level?
How much heat is required to warm 229 g of ice from -47.1°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
Calculate the Gibbs energy of the reaction (delta G rxn) at 25'C for the above rxn when all three gases are at 0.0010 atm. Kp = 1.8 x 10 ^ - 18
Find the activity coefficient of H+ in a solution containing 0.010M HCl plus 0.040M KClO4. What is the pH of the solution?
Mathematically determine which acid contributes a larger concentration of H3O+ ions into the solution, be sure to report the H3O+ concentrations for both, label them clearly, and identify which substance creates a larger concentration?
We wish to prepare a buffer of pH 10 using common laboratory reagents. How many mL of 6M HCl would we have to add to a solution prepared by adding 100 mL of 15M NH3 to 200 mL of water?
A 1L steel tank has a safety valve that opens when the internal pressure exceeds 850 torr. The tank is filled with He at 23 oC and 0.991 atm.
Which of the following reduces the solubility of calcium fluoride?
A solution of 120 mL of 0.150 M KOH is mixed with a solution of 260 mL of 0.200 M NiSO4. How many grams of the precipitate can be formed?
sodium-24 is a radioistope with half life of 15 hours. A sample of pure sodium-24 has an inital mass of 400.0 g. what mass of sodium-24 remains after 60 hours?
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