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reaction A has positve delta H and positve delta S, reaction B has positive delta H and negative delta S, reaction C has negative delta H and positiveS, reaction D has has negative delta H and negative delta S. Which reaction(s) exhibit crossover tempeatures, i.e. temperature-dependendt spontaneity
How many grams of NaCl would be formed from 100 grams of Na2CO3 in the following reaction? Na2CO3 + 2 HCl ? 2 NaCl + CO2 + H2O
Methane and hydrogen sulfide form when 36g H2 reacts with carbon disulfide. calculate the percent yield if the actual yield of CH4 is 69.8 g
calculate the concentrations of h+, oh-, f-, and undissociated hf molecules in 0.10 M hf. Ka for HF is 7.1x10^(-4).
given a list of the natural sciences, including mathematics, physics, chemistry, nbiochemistry, biology, ecology, where does one science end and another one begin?
the osmotic pressure of this soluion was 0.00155 atm at 25 degrees celcius. calculate the molar mass of hemoglobin, which is a molecular compound and a nonelectrolyte.
An intravenous replacement solution contains 4.0mEq/L of Ca2+ ions. How many grams Ca2+ are in 3.0L solution
Determine the pH of a buffer prepared by mixing 0.675 moles of HC2H3O2 and 0.575 moles of NaC2H3O2 in enough water to give 1.00 liter of solution.
A rigid tank of volume 0.5 m^3 is connected to a piston cylinder assembly by a valve, as shown below. Both vessels contain pure water. They a re immersed in a constant-temperature bath at 200°C and 600 kPa
The two occuring isotopes of gallium-69 and gallium-71,which are found in the ratio of 3:2. Determine the atomic mass of gallium.
3.00×10-3 mol of HBr are dissolved in water to make 18.0 L of solution. What is the concentration of hydroxide ions, [OH^-], in this solution?
Write a paper on an article and it shows many different compounds and need a better understanding of where each originated and what steps were made in their synthesis.
A 245 mL stock solution contains 2.3 M Ca(CN)2. When 100 mL of the stock solution is diluted to 120 mL, how many moles of CN- ions will be contained in the dilute solution?
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