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(1) A typical commercial-grade phosphoric acid solution is 75% phosphoric acid by mass, and has a density of 1.57 grams per milliliter. What are the molarity and molality of H3PO4 in this acid?
2) A 2.11 gram sample of naphthalene (C10H8) dissolved in 35.00 grams of para-xylene has a freezing point of 11.25oC. The pure solvent has a freezing point of 13.26oC. What is the freezing point depression constant of para-xylene?
(3) In the reaction A + 2B ----? C + 3D, the rate of disappearance of A is -2.2x10-4 M-1 (a) What is the rate of disappearance of B? (b) What is the rate of formation of D?
Determine the characteristic wavelengths if an electron are accelerated through an electric potential to a kinetic energy of 18kev.
What is the vapor pressure in mmHg of a solution prepared by dissolving 5.00g of benzoic acid (C7H6O2) in 100g of ethyl alcohol (C2H6O) at 35 C?
Write a balanced reaction for the acid-base reaction of diethylbenzyl phosphonate with sodium hydroxide. Which hydrogens are the most acidic?
Calculate the volume of 8.0g of oxygen gas if it has a temperature of 552 K, and a pressure of 5 atmosheres
A reaction is preformed in aqueous solution, and the temperature of the solution increases by 15.78 degrees celcius. Is the reaction exothermic or endothermic?
Determine the percent yield for the reaction and also find out at which point the total pressure = 188 torr.
During a strenous workout, an athlete generates 1890.0 kj of heat energy. What mass of water would have to evaporate from the athlete's skin to dissipate this much heat?
what is the sum of ALL the coefficients in the equation?
At what pH will a solution 0.15 M Cu2+ begin to precipitate as Cu(OH)2? The Ksp for Cu(OH)2 is 1.6 × 10-19.
When 0.0172 mol HI is heated to 500 K in a 2 L sealed container, the resulting equilibrium mixture contains 1.9 g of HI. Calculate Kc for the decomposition reaction 2HI(g) *) H2(g) + I2(g) .
A mechanism for the decomposition of ozone (2O3 --> 3O2) is O3 --> O2 + O; O + O3 --> O2 + O2 What is the molecularity for the first and second elementary reactions?
Aluminum sulphate is used in sand paper, among other uses. How many g of aluminum oxide dihydrate will be needed to produce 500 g of aluminum sulphate by the (unbalanced) reaction below? Al2O3 •2H2O + H2SO4 Al2(SO4)3 + H2O
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