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A) The pH at 1/2 the equivalence point in an acid/base titration was found to be 5.32. What is the value of K sub a for this unknown acid?
B) If 30.15mL of 0.0995M NaOH is required to neutralize 0.216g of an unknown acid, HA. What is the molecular weight of the unknown acid?
From data below, calculate the total heat (in J) associated with the conversion of 0.499 mol ethanol gas (C2H6O) at 301°C and 1 atm to liquid ethanol at 25.0°C and 1 atm.
15.0 g of steam at 373 K is added to 250.0 g of H2O (l) at 298 K at constant pressure of 1 bar. Is the final state of the system steam or liquid water? Calculate ?S for the process.
Calculate the absolute entropy of Cl2(g) at 298k...include the limits of integration. entropy for Cl2= 222.96j/mol.
If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded to the central atom in each case, is the molecule polar, nonpolar, or does it depend on the identity of the outer atom?
In an "anti-bonding" orbital between two atoms, the electrons involved in the bond spend "most of their time" a) in between the two atoms where they act to repel one another
If composite, define each simple sub-system and the internal restraint. If the vessel is shaken vigorously. Is the system then a simple or composite system?
write a balance equation for the formation of C4H10O(i) from its elements (c) By using the information in this problem and data in Table 5.3, calculate ?H°f for diethyl ether
Sketch the typical stress-strain curve for a metal and a ceramic. Using the sketch, indicate the following properties; elastic and plastic regions, yield points, Ultimate Tensile Strength (UTS), strain energy and fracture toughness.
It phosphoresces at 500 nm. If the ratio of the transition probabilities for stimulated emission for the S* --> S to the T --> S transitions is 1.0 x 10^5, what is the half-life of the phosphorescent state
Any number of green plants can photosynthesize glucose (C6H12O6) from carbon dioxide and water, producing oxygen as the remaining product. in an experiment in a biochemistry lab, 500 ml of oxygen was produced in such experiment.
The molar mass of quinine is 324 g/mol. Determine the empirical and molecular formulas of quinine. (Type your answer using the format CO2 for CO2 and use the order CHNO) empirical molecular
if 10.4 mols of hydrogen h3 and 9.1 mols of oxygen o2 are placed together in a container and allowed to react according
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