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Calculate the molar concentration of each ion (Na+ and PO4 3-) in a aqueous Na3PO4 solution when 2.0 g of Na3PO4 is dissolved in water so that the final volume of the solution is 150 ml.
suppose a snack bar is burned in a calorimeter and heats 2000 g water by 20 degc. how much heat energy was released?
The density of an unknown element in the gaseous state is 1.60 g/L at300 K and 1 atm. Which of the following could be the element
bone was dissolved in hydrochloric acid giving 45.0 ml of solution containing calcium chloride cacl2. to precipitate
What countries are the greatest contributors to the pollutants and why - how is acid rain produced from these pollutants
One encloses a mixture of helium and oxygen. Depict a chemical system at equilibrium when ammonia gas has partially decomposed into hydrogen and nitrogen gas.
The decomposition of Phosphine, PH3(g), to P4 (g) and H2 is first order with rate constant of 1.1 min-1. How long will it take to decompose one fifth of the Phosphine
Specify the volume of mineral water to add to each of the five flasks.
A 7.3648 g sample of an oxide of mercury, when heated in a stream of hydrogen, produces Hg() and 0.6126 g H2O. What is formula for the compound?
Group A used 500 moles of styrene and 0.1 moles of benzoyl peroxide while Group B used the same amount of benzoyl peroxide as Group A but used less styrene,150 moles. What would the average molecular weight of each group's polymer sample be?
What is the value of Delta S when 2.7g of CH4 is compressed from 29.0 L to 18.0 L at a constant temperature of 100 C?
A 475 mL sample of gas is collected over water at 27°C and a total pressure of 675 mm Hg. If the vapor pressure of water at 27°C is 26.7 torr, what is the volume of the gas sample at standard pressure?
Compute the freezing point in degrees C of a solution made by dissolving 5.41 g of ethylene glycol(HOC2H4OH) in 60 g of water. The Kfp of the solvent is 1.86 K/m and the normal freezing point is 273 K.
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