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Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 7 to n = 1.
The civilization on the planet Ecton is endangered by the continual illegal disposal of Klingon hair spray which is causing the atmosphere to decompose by a first order rate law
If 15 g of KClO3 are added to 200 g of water at 25 degrees celsius with stirring, how much of the KClO3 will dissolve?
Octane has a density of 0.692 g/mL at 20 Celsius . How many grams of O2 are required to burn 1.30 gal of C8H18
A buffer solution is prepared by dissolving 1.50g each of benzioc acid C6H5CO2H and sodium benzoate NaC6H5CO2 in 150.0mL of solution.
What is the molarity of the carbonate ion in sodium carbonate, Na2CO3, prepared by dissolving 3.5 g of sodium carbonate in enough water to form 0.800 L of solution?
When 10.0 g of NH3 reacts, the actual yield of N2 is 8.50 g. What is the percent yield?
A 11.6-g sample of CaCl2 is dissolved in 139 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C ..
Calcium hydride reacts with water to give gaseous hydrogen and calcium hydroxide
What is the number of moles of atoms of oxygen contained in 49 grams of sulfuric acid, H2SO4?
At 50 degree's Celsius the vapor pressure for methanol and ethanol are 406 and 222 torr, respectively. Given a mixture at 50 degree's Celsius that contains 0.2 mol of methanol and 0.1 mol of ethanol, compute the partial pressures of each liquid an..
A student carefully diluted 25.0mL of 6M NaOH solution in 475mL of distilled water. Calculate the molarity of the diluted solution of base.
What mass of helium gas is needed to pressurize a 112.0 L tank to 262 atm at 25°C?
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