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What is the energy change when the temperature of 12.3 grams of solid tin is decreased from 38.1 C to 24.7 C ?
If 50.0 ml of NaOH solution is required to react completely with 1.24 grams KHP, what is the molarity of the Naoh solution?
What is the pH of a solution that is formed at 25C by combining 300 mL of 0.040 M NaOH with 400 mL
If the gas is at 24 degrees Celsius and 1.0 atm, what mass of helium is in the blimp?
The resulting solution required 51.30 mL of 0.08765 M AgNO3(aq) to precipitate the Cl-(aq) and Br-(aq) as AgCl(s) and AgBr(s). Calculate the mass percentage of NaCl(s) in the mixture.
which phase transitions more likely to occur?
Phosphoric acid, H3PO4, is a triprotic acid, for which Ka1=7.2 x 10-3, Ka2 = 6.3 x 10-8 and Ka3 = 4.2x 10-13. What is the value of Kb for hydrogen phosphate anion, HPO4 2-?
A process stream contains mostly light species 1 and heavy species 2 . A relatively pure liquid stream containing mostly 2 is desired, obtained by a single-stage liquid/vapor separation
What mass of chromium could be deposited by electrolysis of an aqueous solution of Cr2(SO4)3 for 155 min using a constant current of 15.0 A? (F = 96485 C/mol)
A mixture of CaCO3 and CaO weighing 0.680 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.489 g.
A solution is made by dissolving 21.5 grams of glucose (C6H12O6) in 255 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m?
if a solution 110 mL HBr has unknown concentration and is titrated with 80 mL of .150 M NaOH base soultion. Calculate the concentration of the HBr solution.
When the electrons return to the ground state, they lose the excess energy in the form of 640 nm photons. What is the energy gap between the ground state and excited state in the laser material? answer is in J i was absent in class and my test is ..
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