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A microwave oven operating at 1.04e8 nm is used to heat 495 mL of water from 20C to 100C. Calculate the number of photons needed if 92.0 percent of microwave energy is converted to thermal energy of water.
Explain why ionic components are formed when a metal from the left side of the periodic table reacts with a non-metal from the right side. give two examples of each
Write the cell reaction that occurs if the two Pt electrodes are shorted together. What is the standard potential of the cell?
octane has a density of 0.692g/ml at 20C. How many grams of O2 are required to burn 30.5 gal of C8H18
Assume the van der Waals equation of state holds for the n-propane molecule (C3H8). Find values for the constants a and b (online) and use these to calculate the density in (g ml^-1) at a temperature of 1000K and a pressure of 10 atm
In the reaction below, 4.86 atm each of H2 and Cl2 were placed into a 1.00 L flask and allowed to react: H2(g) + Cl2(g) 2 HCl(g) Given that Kc = 89.9, calculate the equilibrium pressure of HCl.
What are the equilibrium pressures of N2O4 and NO2 when 0.61 mol of each gas are introduced
In a flame test experiment, sodium gives the brightest and most persistent color in the flame. Do you think that potassium could be detected visually in the presence of sodium
An exothermic reaction liberates 7.58 kJ of heat in a coffee cup calorimeter containing 157 grams of solution. The temperature of the solution in the calorimeter increases by 11.2°C. How much heat was absorbed by the calorimeter? Assume the specif..
The label on an aerosol spray can contains a warning that the can should not be heated to over 130°F because of the danger of explosion due to the pressure increase as it is heated.
if CO2 gas is collected over water at 25 degrees C and 775torr, what is the partial pressure of the CO2? The vapor pressure of water at 25degrees C is 23.8torr.
Calculate the molar mass (g/mol) of the element to three significant figures.
The principle quantum number defines the shell (which is roughly, but not quite exactly, the row, or period, of the periodic table). Demonstrate the difference between the rows of the periodic table
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