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The molar heats of fusion and vaporization of a certain substance are 2.87 kj/mol and 8.19 kj/mol, and its melting point are -163 degrees Celsius and -125 degrees Celsius , respectively. Calculate the entropy changes for fusion ( solid to liquid) and vaporization (liquid to gas ).
A sample of 0.0020 mole of HCl is dissolved in water to make a 2000mL solution. Calculate the molarity of the HCl solution, the {H3O}, and the pH.
How many grams of sodium lactate must be added to a 1.00L solution of .400M lactic acid to make a buffer with a pH of 3.7??
A 35 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after 30 mL of acid have been added.
In a reaction 82.00 g of sodium reacts with 74.00g of ferric oxide to form sodium oxide and iron metal. calculate the mass of solid iron produced
What is the rate constant of a first-order reaction that takes 9.00 minutes for the reactant concentration to drop to half of its initial value?
A sample of gas at 47°C and 1.03 atm occupies a volume of 2.20 L.What volume would this gas occupy at 107°C and 0.789 atm?
You have measured the absorbance for a vitamin sample to be 1.2 at a wavelength of 264. Can you use this reading to determine the INITIAL CONCENTRATION of your vitamin sample?
Explain fructose solution with a concentration f 80mg/ml, but need to take 3.5L of fructose solution with a concentration of 300 mM.
The temperature of the water and that of the gas are identical at 26oC. how many moles of helium have been evolved.
Describe the major absorption bands in the IR spectrum - indicate the bonds responsible for those peaks which prove you have synthesized isopentyl acetate and that it is an ester.
Aspirin's mode of action is to make a covalent bond with the active site of the COX II enzyme which inactivates the enzyme. A nucleophilic histidine side chain
Calculate the energy of attraction (in eV) between a cation with a valence of +2 and an anion with a valence of -3,
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