Which initial substance remained in excess
The reaction 2Al + 3MnO ----> Al2O3 + 3Mn proceeds till the limiting substance is consumed. A mixture of 220g Al and 400g MnO was heated to initiate the reaction. Which initial substance remained in excess and by how much?
Expected delivery within 24 Hours
A photon in the gamma ray region of the electromagnetic spectrum has an energy of 9.12 × 10-14 J, calculate the wave length in pm of the photon. Express answer in scientific notation.
Dry air had a CO2 mole fraction of 0.00038 in 2007 (compared with 0.00032 in 1965). Calculate the total mass of CO2 that strikes 1 cm^2 of one side of a green leaf in 1 s in dry air at 25oC and 1.00 atm. Show all calculations.
If oxygen gas were collected over water at 22 degrees Celsius and the total pressure of the wet gas were 650 mm Hg, what would be the partial pressure of the oxygen?
Determine the mass of air that escaped each tire over the course of the trip. (b) What will the tire pressure be when the air inside the tires (at end of trip) returns to 23oC?
What is the minimum amount of solvent needed to recrystallize 0.200 g of phenacetin? How much would be lost in the recrystallization?
The specific rotation of (R)-(+)-glyceraldehyde is +8.7. If the observed specific rotation of a mixture of (R)-glyceraldehyde and (S)-glyceraldehyde is +2.5, what percent of glyceraldehyde is present as the R enantiomer?
This problem states, "when a 9.55 g sample of solid NaOHdissolves in 100.0 g of water in a coffeecup calorimeter, the temprises from 23.6 to 47.4. Calculate change in H. for the solution process:
A hurricane is simply a steam engine which draws much of its destructive power from the evaporation and condensation of water. The heat of condensation of water is -2257 kJ/kg.
The rate constant for a certain chemical reaction is 0.00250 L mol-1 s-1 at 25.0 C and 0.0125 L mol-1 s-1 at 50.0 °C. What is the activation energy for the reaction, expressed in kJ mol-1?
How many different values of the principle quantum number can be found in the ground state electron configuration of nickel?
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!