Get college assignment help at uniessay writers The molar enthalpy of fusion of solid silicon is 46.4 kJ mol-1, and the molar entropy of fusion is 27.6 J K-1 mol-1. (a) Calculate the Gibbs free energy change for the melting of 1.00 mol of silicon at 1.71E 3 K. (b) Calculate the Gibbs free energy change for the conversion of 2.98 mol of solid silicon to liquid silicon at 1.71E 3 K. (c) Will silicon melt spontaneously at 1.71E 3 K? (d) At what temperature are solid and liquid silicon in equilibrium at a pressure of 1 atm?
10.08g of potassium chlorate, KClO3 is heated to decomposition according to the following equation. How many grams of O2 gas will be produced?? 2KClO3 (s) –> 2KCl (s) 3O2
In a certain experiment, 28.0 mL of 0.250 M nitric acid and 53.0 mL of 0.320 M potassium hydroxide are mixed. Calculate the amount of water formed in the resulting reaction. What is the concentration of H and OHin excess after the reaction goes to completion?
Calculate the number of molecules in 9.00 moles rm H_2S.
Which starting material is the limiting reagent in this procedure? Which reagent is used in excess? How great is the molar excess (how many times greater)?
If a bottle of nail polish remover contains 177 ml of acetone, how much heat would be released by its complete combustion? The density of acetone is .788 g/ml
Which of the following molecular geometries could lead to linear molecule after removal of one atom? A.T-shaped B.See-saw c.Trigonal Bipyramid d.Triangular planar e.Bent 2. What is hybridization of phosphorus in PS2-,PS3- and PS43-
What is the molar mass of 35 g of an unknown substance that depresses the freezing point of .350 kg of water .50˚C? Kf for water is 1.86C/m.
Identify the mechanism by which each of the reactions above proceeds from among the mechanisms listed. Use the letters a – i for your answers.
Get college assignment help at uniessay writers A 10.0-mL sample of a HCl solution has a pH of 2.000. What volume of water must be added to change the pH to 4.000?
Suppose we mix 50.0-mL of 0.050M HCl with 150.0-mL of 0.10M HNO3. Calculate the concentration of ALL the chemical species in the solution. Calculate the pH while you are at it.
I need help with number 6.
Suppose 8.00g of methane is allowed to burn in the presence of 16.00g of oxygen. How much (in grams) CH4, O2, CO2, and H2O remain after the reaction is complete?
Although it doesn’t particularly want to give up a proton itself, boric acid, B(OH)3, acts as an acid in water because of the reaction: B(OH)3 H20 B(OH)4^-1 H Given that the Ka of boric acid is 5.8×10^-10M, what is the pH of a 0.50M boric acid solution? Are there any good approximation available?
You would like to measure the heat of neutralization of an acid with a base. You mix 75 mL each of 0.65 M HCl and 0.65 M NaOH, both at a temperature of 25.5 °C in a calorimeter cup equilibrated to that same temperature. After following the temperature change for 10 minutes and extrapolating it back to the time of addition, you find that the “final temperature” after mixing was 29.3 °C. Previously you measured the heat capacity of the calorimeter cup (Ccup) to be 83 J/°C.
A mixture of 75%mole propane and 25%mole hydrogen is burned with 25% excess air. Fractional conversions of 90% of the propane and 85% of the hydrogen are achieved; of the propane that reacts, 95% reacts to form CO2 and the balance to form CO. 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 basis. Use extent of reaction species balance to solve.
A flask containing 90.0mL of hydrogen was collected under a pressure of 97.5 kilopascals. At what pressure would the volume be 70.0mL, assuming the temperature is kept constant?
A sample of dinitrogen tetraoxide occupies 16,500 mL at STP. What is the mass of the sample?
What is the H3O in a solution that contains 1.64g HNO3 in .420L of solution?
The post The molar enthalpy of fusion of solid silicon is 46.4 kJ appeared first on uniessay writers.