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A voltaic cell is constructed with two Zn+2-Zn electrodes. The two cell compartments have [Zn+2]=5.00 M and [Zn+2]=1.00 x 10^-2 M, respectively. What is the standard emf of the cell?
When 0.6 g of impure zinc reacted with an excess of hydrochloric acid, 135 mL of hydrogen was collected over water at 10?C. The external pressure was 745.4 Torr.
Determine the molecular formula of a compound which has a empirical formula of CH3 and a molar mass of 60.0 g/mol.
Draw the lawis structure and structural formulas for CCl3F. Sketch the space-filing model and the charge-density model for this molecule.
What is the analytical molarity of FeCl3 in a solution prepared by dissolving 1.340 g of FeCl3 in water and diluting to 1.0000 L?
Draw a detailed mechanism (including arrows to show electron flow) for the synthesis of acetylferrocene from ferrocene being reacted with H3PO4 and (CH3CO)2O.
Write the balanced reaction for the complete combustion f octane (C8H18) and then determine how many moles of oxygen it would require to burn 240.00 moles of octane? 2 350.00 grams of octane?
A mass of 48.5 g of a certain substance can be dissolved in 29.1 cm3 of water at 20 Degree Celius. Calculate the solubility of this substance per gram of water at the same temperature.
The rate law for a hypothetical reaction is rate=k[a]2. when the concentration is .10 moles/liter, the rate is 2.7 times 10-5 moles/liter second. what is the value of k?
If 2.50 L N2 react with 7.00 L H2, what is the theoretical yield (in liters) of NH3? Assume that the volumes of reactants and products are measured at the same temperature and pressure.
A 45- piece of ice at 0 is added to a sample of water at 12. All of the ice melts and the temperature of the water decreases to 0 .
A 45- piece of ice at 0 is added to a sample of water at 12. All of the ice melts and the temperature of the water decreases to 0. How many grams of water were in the sample?
Small helium-neon lasers emit 3.50 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
A 13 mL sample of a solution of Pb(ClO3)2 was diluted with water to 17 mL. A 15 mL sample of the dilute solution was found to contain 0.027 moles of Pb2+. What was the concentration of Pb(ClO3)2 in
A an aqueous methanol (CH3OH) solution has a mole fraction of 0.525 of methanol. What mass of water would be present in 890. g of this solution?
A current of 2.40 A is passed through a solution containing Cu2+(aq) for 30.0 minutes, with copper metal being deposited at the cathode. What mass of copper, in grams, is deposited? The reaction at
How many of the following changes wouldalter the numerical value of the equilibrium constant Kp for the reaction 2OF2(g) --> O2(g) + 2 F2(g)? I) an increase in temperature II) a decrease of the c
0.115 mole of CH4 was placed in a 1.00 L container. At equilibrium it was found that the [C2H2] = 0.035 M. What is the value of the equilibrium constant?
Insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. A bottle contains 475 of insulin at a concentration of 30.0 . What is the total mass of insulin in the
Many gases are shipped in high-pressure containers. Consider a steel tank whose volume is 65.0 L and which contains O2 gas at a pressure of 16500 kPa at 21 degrees C.
A solution is 40% acetic acid by mass. The density of this solution is 1.049 g/mL. Calculate the mass of pure acetic acid in 480 mL of this solution at 20 C.
Calculate the theoretical amount of 3 M sodium hydroxide needed to convert the benzoic acid (half the weight of the sample) to its water - soluble salt.
Based on molecular structure, arrange each of the following sets of molecules in order of increasing acidity. Explain your answer for each in one or two complete sentences.
What is the molarity of a solution created by dissolving 75.3 grams of sodium carbonate in enough water to create 2.50 liters?
Such a compound has a melting temperature of 1775 °C. What type of bonding do you think is involved in this compound? Give your reasoning.