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in the hydrogen atom, for which transition is the emission line observed at shorter wavelength, n=4 to n=2 or n=5 to n=1? Show the equation needed to figure this out. Consider the relative size of delta E to determine the relative wavelength.
How many grams of Na3PO4 will be needed to produce 400ml of a solution that has a concentration of Na+ ions of 0.900 ?
If 1.0 l of 0.10 M sodium phosphate is mixed with 1.0 l of 0.10 M magnesium nitrate, magnesium phosphate is produced. Calculate the concentration of each ion when the reaction is finished and the mass of precipitate.
Calculate delta E for the combustion of a gas that releases 195.0 kJ of energy to its surroundings and does 54.5 kJ of work on its surroundings.
what are the techniques used to isolate pure chemical substances from their natural sources? explain please.
A solution was prepared by dissolving 620 grams of ethylene glycol, C2H6O2 in 1000 grams of water. Find the concentation of ethylene glycol in molality. Find the freezing point and boiling point of the solution. For water Kf= -1.86 Celsius m-1 and..
the molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol and its normal boiling point is 91 degrees celsius. what is the vapor pressure of BBr3 at 27 degree celsius ( R=8.314 kJ/mol)?
If the heated copper is then placed into the water in the insulated container, given that the specific heat of copper is 0.385J/(gC), calculate the maximum temperature of the water after the copper metal is added.
What is the pH of the solution when 50 grams of Ca(OH)2 was added to 1 liter of water? Ksp of Ca(OH)2 = 6.5 x 10^-6
Write the structure of a different product that could have been formed if you used ethanol containing substantial amount of water instead of the absolute ethanol
How much heat does your body lose when 1.5 g of sweat evaporates from your skin at 25 C? (Assume that the sweat is only water.) The heat of vaporization of water at 25 C is 44.0 kJ/mole.
In photosynthesis, plants form glucose and oxygen from carbon dioxide and water. calculate delta H, delta S and delta G of the reaction. Delta H is 2800.
Sterling Silver is 92.5% silver by mass. How many lbs of silver are there is a 45.0 Mg piece of sterling silver?
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