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Calculate the pH of each of the following solutions. Calculate the pH after .020 mol NaOH is added to 1.00 L of each of the four solutions in question 1
Rubidium has two naturally occurring isotopes: with mass 84.9118 and a natural abundance of 72.17%, and with mass 86.9092 and a natural abundance of 27.83%. Calculate the atomic mass of rubidium.
Analysis of a sample of a covalent compound showed that it contained 14.4% hydrogen and 85.6% carbon by mass. What is the empirical formula for this compound?
Calculate the equilibrium concentration, in mol-L, of the following gases in the container at 483 K a) H2 b) H2S. Calculate the value of the equilibrium constant, Kc, for the decomposition reaction at
An average cup of coffee contains about 125 mg of caffeine, CaHroNqOz. If a student drinks 5 cups of coffee before their 8 AM Chem lecture in a desperate attempt to try to stay awake:
Based upon the results of this experiment, indicate whether Br+, Br-, or Br· initiates the isomerization of dimethyl maletae to dimethyl fumarate.
Water Vapor and nitrogen dioxide gas, NO2, are combined to manufacture ammonia. A byproduct of this reaction is oxygen gas. Write the balanced chemical equation for this reaction.
What should be the instantaneous rate of the first order decomposition of 3% H2O2 (3g H2O2 per 100g solution)? Assume the solution has a density of 1.00g/mL and that k=3.66E-3 s-1.
Predict how the solubility of the ammonium chloride would be affected. Explain the basis for each of your predictions.
Isopropyl alcohol, C3H8O, is sold in drug stores as rubbing alcohol. Isopropyl alcohol is a water-soluble liquid with a density of 0.785 g/mL at 25 oC. Calculate the molarity of a solution of isopro
Predict how the enthalpy, entropy, free energy, and temperature change in the system during this process. Explain the basis for each of your predictions.
A zero-order reaction has a constant rate of 3.50×10-4 M/rm s. If after 65.0 seconds the concentration has dropped to 1.00×10-2 M, what was the initial concentration?
How many seconds are required to produce 4.94 mg of chromium metal from an acidic solution of potassium dichromate, using a current of 0.234 A?
A soft drink contains 35 mg. of sodium in 315g. of H2O. What is the concentration of sodium in the soft drink in mass percent?
Suppose that 45.0 g of water at 85°C is added to 105.0 g of ice at 0°C. The molar heat of fusion of water is 6.01 kJ/mol and the specific heat of water is 4.18 J/g°C. Based on this: a) w
If, in a certain experiment, over a specific time period, 0.0048 mol PH3 is consumed in a 2.0-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?
Consider a gas at 1.00 atm in a 5.00 L container at 20 degrees celsius. What pressure does the gas exert when transferred to a volume of 2.77 L at 43 degrees celsius?
The hot combustion product gas passes through a boiler in which heat transferred from the gas converts boiler feedwater into steam. Calculate the concentration of CO (ppm) in the stack gas on a dry
At a particular temperature, N2O5 decomposes according to a first-order rate law with a half-life of 3.0 s. If the initial concentration of N2O5 is 1.0 × 1016 molecules/cm3, what will be the c
What mass of ethanol, C2H5OH a nonelectrolyte, must be added to 10.0 L of water to give a solution that freezes at -10.0C? Assume the density of water is 1.0 g/mL. Kf of water is 1.86C/m.
To produce 856 g of ammonia gas using air as your source of nitrogen gas, what volume of air is required if the air is introduced at 27°C and 760 mmHg? (the mole fraction of nitrogen gas in air
A 260-{rm mL} flask contains pure helium at a pressure of 759 {rm torr}. A second flask with a volume of 470 {rm mL} contains pure argon at a pressure of 725 {rm torr}.If the two flasks are connecte
Write four balanced equations for the reactions to separate and recover m-nitroanilin, benzoic acid, and naphthalene. Write out the full structures.
When 31 g of phosphorus reacts with oxygen gas, 71 g of an oxide of phosphorus is the product. What mass of oxygen gas is needed to produce 13 g of this product? (2 significant figures).