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The mass of an electron is 9.11 * 10^{-31} kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31*10^{-10}m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00*10^8 m/s
If 155mL of wet {grm{H}}_2 is collected over water at 24 ^circ {rm C} and a barometric pressure of 739torr , how many grams of {grm Zn} have been consumed.
If 8.6 L of H2 reacted with 4.3L of O2 at STP, what is the volume of the gaseous water collected (assuming that none of it condenses)? 2H2(g) + O2(g) -> 2H2O(g)
Calculate the concentration of a solution of FeCl3 was prepared by dissolving 13.86 gm of FeCl3 in 2.5L of water.
Thermochemistry : Comparing Heat Capacity of Bricks and Water, A house is designed to have passive solar energy features. Brickwork incorporated into the interior of the house acts as a heat absorber. Each brick weighs approximately 1.8 kg
Ethylene glycol, HOCH2CH2OH, is effective as an antifreeze, but it also raises the boiling temperature of automobile coolant, which helps prevent loss of coolant when the weather is hot.
Compute the amount of heat evolved in the oxidation of 32.0 grams of Fe at the temperature 25 oC and pressure 1 atm pressure ( ΔHfo(Fe 2 O 3 ,s) = -824kJ/mol)
A green leaf has a surface area of 3.00cm^2 . If solar radiation is 1040W/m^2 , how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504nm for solar radiation.
3.00×10-3 mol of HBr are dissolved in water to make 18.0 L of solution. What is the concentration of hydroxide ions, [OH^-], in this solution?
If the gas was not pure butane but 10 mole percent propane and 90 mole percent butane then determine how would the MW value be affected?
Determine the mass percentage concentration of a sodium hydroxide solution produced by mixing 50.0 mL of a 25 % (density=2.45g/mL) sodium hydroxide solution with 10.0mL of H 2 O?
If 8.40 kJ of heat is needed to raise the temperature of a sample of metal from 15 degrees celsius to 20 degrees celsius, how many kilojoules of heat will be required to raise the temperature of the same sample of metal from 25 degrees celsius to ..
Thermal equilibrium, 10.0g of Fe(s) at 98.0 degrees Celsius is placed in 50.0mL of H2O(l) at 20 degrees Celsius
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