1)Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.

How many grams of KHP are needed to exactly neutralize 21.1 mL of a 0.399 M potassium hydroxide solution ?

grams KHC₈H₄O_4.

2) Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.

What volume of a 0.363 M barium hydroxide solution is needed to exactly neutralize 4.46 grams of KHP ?

ANSWER:   mL barium hydroxide

Below is a list of pairs of compounds. Choose the pairs from the list that would NOT form a precipitate if mixed together.

a. KCl and Na3PO4

b. Ca(NO3)2 and MgSO4

c. FeCl3 and LiOH

d. CuSO4 and (NH4)3PO4

e. sodium nitrate and calcium chloride

f. sodium sulfate and barium nitrate

g. zinc nitrate and potassium sulfate

h. lead(II) nitrate and sodium carbonate

i. potassium phosphate and cobalt(II) chloride

j. copper(I) nitrate and magnesium chloride

1a) A block of an alloy of mass 33.0 g and at a temperature of 289.36 K is placed in a calorimeter containing 36.0 g of ethylene glycol at 348.15 K. If the final temperature of the alloy and ethylene glycol is 306.28 K, calculate the specific heat (in J/g/K) of the metal. The specific heat of ethylene glycol is 2.39 J/g/K. Express your answer to three significant figures in scientific notation.

b) A 0.0763 g sample of solid RbBr (s) is dissolved in 449 mL of water in a coffee cup calorimeter. Once all of the RbBr (s) is dissolved in the water, the final temperature of the solution is found to be 21.76°C. If the initial temperature of the water in the calorimeter was 24.26 °C, calculate the calorimeter constant (in J/K) for the coffee cup calorimeter.

Report your answer to three significant figures.

The heat of the solvation of RbBr (s) is 21.88 kJ/mol.

c) For a given chemical process, the system absorbs 338 kJ of heat and the surroundings perform 348 kJ of work on the system. What is the value of ΔU (in kJ) for the process? Report your answer to three significant figures.

Consider the reaction, N2(g) + 3 H2(g) → 2 NH3(g). Suppose 56 g of N2(g) reacts with 18 g of H2(g).

d. What is the limiting reactant?

e. When the reaction is complete, how many grams of NH3(g) are produced?

f. When the reaction is complete, how many grams of N2(g) remain?

g. When the reaction is complete, how many grams of H2(g) remain?

h. If the reaction actually produced 55 g of NH3(g), what is the percent yield?

For the reaction Ti(s)+2F2(g)→TiF4(s) compute the theoretical yield of the product (in grams) for each of the following initial amounts of reactants. a)6.0 g Ti, 6.0 g F2 (express answer to two sig figs) b)2.3 g Ti, 1.4 g F2 (express answer to two sig figs) c)0.234 g Ti, 0.298 g F2 (express mass to three sig figs) Please show steps!

Which statements regarding combustion analysis to determine percent composition are not correct?
      I. The mass of oxygen in the sample compound can be determined from the mass of carbon dioxide that is produced.
      II. If a compound contains an element other than carbon and hydrogen, combustion analysis cannot be used to determine its empirical formula.
      III. Combustion analysis data alone is not sufficient to determine the molecular formula with certainty.
IV. If some CO is produced rather than all CO₂, then the empirical formula that is calculated will be too high in carbon.

For this assignment, the target compound that you should synthesize is benzyl methyl ether. This is a
substitution reaction. Examine the product and determine which bonds may be formed. Keep in mind the
substitution pattern of the product and the nature of the mechanism accommodated by this arrangement.

starting materials: benzyl chloride, ether, NaOMe

A. Approx TLC values of product and starting material

B. Write mechanism for this reaction

Calculate ?G?rxn and K for each of the following reactions.

Part A

The reaction of Cr2+(aq) with Cr2O2?7(aq) in acid solution to form Cr3+(aq).
Calculate ?G?rxn.

Part B

Calculate K.

Express your answer using two significant figures.

Part C

The reaction of Cr3+(aq) and Cr(s) to form Cr2+(aq). [The reduction potential of Cr2+(aq) to Cr(s) is -0.91 V.]
Calculate ?G?rxn.

Express your answer using two significant figures.

Part D

Calculate K.

Express your answer using one significant figure.

Carbon dioxide makes up approximately 0.04% of Earth's atmosphere. If you collect a 2.5 L sample from the atmosphere at sea level (1.00 atm) on a warm day (27 ∘C), how many CO2 molecules are in your sample?

Based

Calculate , using the equipartition theorem, the constant-volume heat capacity of CO_2 in three cases:

a.) no vibrations active (the low-T limit)

b.) all vibrations active (the high-T limit)

c.) with just the lowest-energy vibration active.

Imagine an isolated, 10-liter cylinder containing one mole of ideal gas held in the left five liters of the cylinder by a piston, initially locked in place. The right half of the cylinder is evacuated; the entire system is maintained at constant temperature. When the piston is freed to move frictionlessly, we could track the motion of the piston and the volume in 1-liter increments. Calculate the change in entropy (in J mol^-1 K^-1) of the gas upon expansion after each of the five 1-liter increments. Demonstrate that the total entropy is indeed maximized when the expansion is complete. Make a table.

define polymers and how are they synthesized