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Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level n = 7 to the level n = 2cal
the density of an aqueous ethanol solution is .789 g/mol. How many grams of ethanol should be mixed with water to make 225mL to make a 4.5% ethanol solution?
An experiment identical to the one you just preformed is done by another student.except the amperage is continuously increased while the sulfuric acid concentration is kept constant
How many grams of pure solid PbCl2 could be formed from the reaction of 5.176 g of lead with excess HCl?
What is the pH of a phosphate buffer when [H2PO4-] = 40 mM and [HPO42-] = 30 mM?
Calculate the heat released when 2.00L of Cl2(g) with a density of 1.88 g/L react with an excess of sodium metal as 25°C and 1 atm to form sodium chloride. [H°f(NaCl) = -411.0 kJ/mol
In the reaction of sodium benzoate with hydrochloric acid to form benzoic acid, if 1.53 g of benzoic acid were formed, how many mmol of sodium benzoate
Calculate the % yield of Al2(SO4) from the reaction: 2Al(OH)3(s) + 3H2SO4(aq) -> Al2(SO4)3(s) + 6H2O(l) given that 205 g of Al(OH)3 react with 751 g of H2SO4 to yield 252 g Al2(SO4)3.
Consider the combustion of ethane 2C2H6 + 7O2 yields 4CO2 + 6H2O If the ethane is burning at the rate of 0.1 mol/L*s, at what rates are CO2 and H2O being produced?
Explain why the boiling point of an aqueous solution that is 1.0 m in glucose (C6H12O6) is 100.51oC whereas The boiling point of an aqueous solution that is 1.0 m in NaCl is 101.02 oC .
Nitric oxide, oxygen, and nitrogen react by the following equation. 2 NO(g) N2(g) + O2(g)Kc = 2.3 10^30 at 298 K
A scuba diver with a lung capacity of 5.2 L inhales a lungful of air at a depth of 45 m and a pressure of 5.5 atm. If the diver were to ascend to the surface (where the pressure is 1.0 atm) while holding her breath.
If 400. mL of NO at STP is reacted with 500. mL of O2 at STP, calculate the partial presure of NO2 after the reaction goes to completion. Assume constant volume.
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