General Chemistry Answers

How many grams of (NH4)2SO4 (fw = 132.14 g/mol) should be added to 425 mL of a 0.258 M solution of NH3 to achieve a buffer solution with a pH of 9.44? Kb for NH3 = 1.8 x 10-5

What mass ofPCl

5

P

C

l

5

 will be produced from the given masses of both reactants?

Express your answer to three significant figures and include the appropriate units.

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 C4H10 + 6O2 --> 4CO2 + 5H2O

Silver metal reacts with sulfur to form silver sulfide according to the following reaction: 2Ag(s) + S(s) → Ag2S(s) a. Identify the limiting reagent if 50.0 g Ag reacts with 10.0 g S. b. What is the theoretical yield in g of Ag2S produced from the reaction? c. What is the amount in g of the excess reactant expected to remain after the reaction? d. When the reaction occurred, the amount of Ag2S obtained was 45.0 g. What is the percent yield of the reaction? Step 1. Analyze the problem Step 2. Determine the limiting reagent. Step 3. Compute the theoretical yield. Step 4. Compute the percent yield

A solution was prepared by dissolving 23 grams of ethyl alcohol in a 56 grams of water.

Calculate the volume percent and mole fraction of this solution.

Find the molality and molarity of the sample consisting 75% Copper and 25% Nickel by mass. The computed density of this sample is 0.00639 g/mm3.

Determine the magnetic property of manganese by showing the electron configuration and valence orbitals

Problems on enzyme reaction kinetics

1. Initial rates of enzyme-catalyzed reaction for various substrate concentrations are listed below:

Rate

mol/(L min)x10^6 Substrate concentration

(mol/L)

177. 0.0041

173. 0.00095

125. 0.00052

106. 0.000103

80. 0.000049

67. 0.0000106

43 0.0000051

a) Evaluate Vmax and Km by a Lineweaver-Burk plot.

b) Using the Eadie-Hofstee plot, evaluate Vmax and Km.

c) Plotting reaction rate and substrate concentration, find another estimate of Vmax and Km.

The molar mass of caffeine is 194.19 g. What is the molecular formula of caffeine?

Consider the following reaction at equilibrium:

 2 NOBr(g) + heat <- -> 2 NO(g) + Br₂(g)

If the reaction mixture is moved to a larger vessel, the equilibrium will