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17,891 solutions

Calorimetry

Q. If you combine 370.0 mL of water at 25°C and 130.0 mL of water at 95.00°C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

Solved • Mar 30, 2020

Cell Potential

Q. Calculate the standard free-energy change at 25 °C for the following reaction: Mg(s) + Fe^2+(aq) → Mg^2+(aq) + Fe(s) Express your answer to three significant figures and include the appropriate units.

Solved • Mar 4, 2020

Cell Potential

Q. Calculate the standard cell potential (E°) for the reaction X(s) + Y^+(aq) → X^+(aq) + Y(s) if K = 7.35x10^-3 Express your answer to three significant figures and include the appropriate units.

Solved • Mar 4, 2020

Cell Potential

Q. Tarnish on tin is the compound SnO. A tarnished tin plate is placed in an aluminum pan of boiling water. When enough salt is added so that the solution conducts electricity, the tarnish disappears. Imagine that the two halves of this redox reaction were separated and connected with a wire and a salt bridge. Calculate the standard cell potential given the following standard reduction potentials: Al^3+ + 3e^- → Al; E° = -1.66 V Sn^2+ + 2e^- → Sn; E° = -0.140 V Express your answer to two decimal places and include the appropriate units.

Solved • Mar 4, 2020

Chemistry Gas Laws

Q. If the pressure of a sample of gas with a constant number of moles is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change? A. 8 B. 2 C. 1/2 D. 1/4 E. 1/8

Solved • Mar 30, 2020

Redox Reaction

Q. Potassium permanganate, KMnO4, is a powerful oxidizing agent. The products of a given redox reaction with the permanganate ion depend on the reaction condition used. In basic solution, the following equation represents the reaction of this ion with a solution containing sodium fluoride: MnO4^-(aq) + F^-(aq) → MnO2(s) + F2(aq) Since this reaction takes place in basic solution, H2O(l) and OH^-(aq) will be shown in the reaction. Places for these species are indicated by the blanks in the following restatement of the equation: MnO4^-(aq) + F^-(aq) + ___ → MnO2(s) + F2(aq) + ___ What are the coefficients of the reactants and products in the balanced equation above? Remember to include H2O(l) and OH^-(aq) in the blanks where appropriate. Your answer should have six terms. Enter the equation coefficients in order separated by commas (e.g., 2, 2, 1, 4, 4, 3). Include coefficients of 1, as required, for grading

Solved • Mar 4, 2020

Calorimetry

Q. 29) When 0.7521 g of benzoic acid was burned in a calorimeter containing 1,000. g of water, a temperature rise of 3.60°C was observed. What is the heat capacity of the bomb calorimeter, excluding the water? The heat of combustion of benzoic acid is –26.42 kJ/g. A) 752.1 kJ/°C B) 1.34 kJ/°C C) 4.18 kJ/°C D) 15.87 kJ/°C E) 5.52 kJ/°C

Solved • Mar 30, 2020