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Calculate the entropy change of the universe as a result of the following processes:
(a) A copper block of 0.4 kg mass and with heat capacity at constant pressure of 150J/K at 100°C is placed in a lake at 100°C.
(b) The same block at 100C is dropped from a height of 100m into the lake.
(c) Two such blocks at 100°C and O°C are joined together.
If 3.65 mL of vinegar needs 41.5 mL of 0.150 M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in a 1.20 qt sample of this vinegar
Problem- Place each charge form of alanine under the pH condition where it would be the predominant form. The pKa values for the carboxyl group and amino group of alanine are approximately 2.3 and 9.7, respectively.
1. A sample of helium gas occupies 120 mL at 71 mmHg. For a gas sample at constant temperature, determine the volume of helium at 45 mmHg. Show your work.
the molecular weight of citric acid is 0.030m. how many grams of citric acid molecular weight 192 are present in a
The atoms in the periodic table span 7 shells. Order them from lowest to highest energy. Why do they have this order
What holds the O atoms to each other in a molecule of oxygen gas? Which is true when comparing samples of C6H6(l) (has C-H bonds) to C2H5OH(l) (has an O-H bond)?
The problem states that 4.36g of an unknown alkali metal hydroxide is dissolved into 100.0 ml of water. It is then titrated with 2.50 M HCl using an acid-base indicator. The equivalence point is 17.0 ml of HCl.
If I leave 750 mL of 0.50 M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates, what will the new concentration of the sodium chloride solution be
An ideal gas in a cylinder fitted with a piston expands at constant temperature from a pressure of 6 atm and a volume of 8.0 L to a final volume of 19 L against a constant opposing pressure of 5.2 atm. How much heat does the gas absorb, expressed ..
What is the FORMULA for the limiting reagent? What is the maximum amount of potassium carbonate that can be formed in grams?
The Redox reactions are coupled reactions. As one molecule is being oxidized, a second molecule is getting reduced. State a redox reaction using fumarate (and its reduced form succinate) and acetate (and its reduced form acetaldehyde)
The next question was this: "What is the PH at it's equivalence point? AS part of your answer, define equivalence point. What does it mean for a substance to be at its equivalence point?"
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