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A Styrofoam cup holding 116 g of hot water at 1.00 102°C cools to room temperature, 16.1°C. What is the change in entropy of the room? (Neglect the specific heat of the cup and any change in temperature of the room.)
Total SO2 85 mg/l Need to determine how much free SO2 needed for the molecular SO2 for the equation K 2 S 2 O 5 (g) to add = VxD/A V=volume D=dose mg/l SO2 to add A=SO2 activity as a decimal fraction
A 25:75 mixture of acetone:toluene is heated to 70 C at a pressure of 760 mmHg. What is the total vapor pressure of the system? Is the system a liquid below boiling, at boiling, or a gas?
Why did the discrepancy between experiments and classical theory for blackbody radiation occur at high and not low frequencies
25mL of a .10M solution of the weak acid hydrofluoric acid, HF, is titrsted with .10M solution of the weak base amonia, NH3. Will the pH at the equivilance point be less than 7 equal to 7 or greater than 7? Explain. Ka for HF is 7.2e-4 and Kb for ..
Which is the best solvent for recrystallizing acetanilide, water or dichloromethane (CH2Cl2)? Explain your answer to receive lifesaver rating.
human growth hormone in 25.0 mL of solution has an osmotic pressure of 0.109 torr at 25.0°C. What is the molar mass of human growth hormone?
Calculate the wavelength (in picometers) associated with hydrogen atom moving at a speed of 3.13 x 10^3 cm/s
Kb for NH3 is 1.8 x 10^-5. What is the pH of a 0.35 M aqueous solution of NH4Cl at 25.0 degrees C? NH4 (aq) NH3(aq) + H+ +Cl-(aq)
Suppose that aqueous solutions of barium nitrate and potassium carbonate are mixed. What is the name of the compound or compounds that precipitate
What if you were designing an engine for a SUV that produced 2.40 × 102 L/s of exhaust with a CO content of 1.9 mg CO per 1L of exhaust? What volume of catalytic matrix would you need to reduce the CO emission in this automobile?
to find Sorxn and determine if the reaction is spontaneous at 900oC.(2 pts). 2NH3(g) + 3CuO(s) %u2192 3H2O(l) + N2(g) + 3Cu(s)
The lattice points in zinc chloride are occupied by molecules while the lattice points in zinc metal are occupied by atoms.
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