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Hexane has a negligible absorbance above 200nm. S sample of Hexane containing 20.0 mg/L of an aromatic compound (MW=114.3 as impurity had an absorbance value of 0.351 at 254 nm in a 2.00 cm pathlength cuvet. From this information it can be concluded that the molar adsorptivity of aromatic compound in the hexane compound sample was?
Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO3(s) → 2NaCl(s) + 3O2(g)
How many moles of oxygen gas are needed to completely react to produce 0.94 moles of sulfur trioxide?
A student takes 185. g of BaCl2, and reacts it according to the following equation: 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3 How many moles of AlCl3 are formed?
Fish produce glycerol to survive the freezing waters of the Arctic. Determine the degree to which the freezing point of blood and other biological fluids is lowered with the help of glycerol. What is the ideal concentration range of glycerol requi..
When a clear aqueous solution of calcium chloride (CaCl2) is mixed with a clear aqueous solution of sodium carbonate (Na2CO3), a white solid precipitate forms.
How many milliliters of a 0.300 M lead(II) nitrate solution are needed to react with 50.00 mL of a 0.500 M potassium chromate solution?
Starting with 2.5 grams of vitamin D3 and 10mg of palladium catalyst, how many millimoles of H2 will be necessary to hydrogenate all of the Carbon Carbon double bonds in D3?
You will then make a Kool-Aid solution by dissolving the powder in an entire packet of lemon-lime Kool-Aid in 250.00 mL solution. You find the powder in a packet of lemon-lime Kool-Aid has a mass of 3.629 g.
An aerosol spray can with a volume of 350 mL contains 3.2 g of propane gas (C3H8) as propellant. What is the pressure (in atmospheres) of gas in the can at 65oC?
The decay constant for strontium-90 = 0.0247y-1. if 10.0 g decay for exactly 60 years then determine how many grams of strontium-90 remain.
Calculate the pH at the beginning of a titration of 50.00 of 0.005M HA (Ka=2.0*10^-2) with NaOH solution. If the quadratic equation is assumed to be accurate
The temperature is increased to 45 degree celcius then determine what is the pressure in the cylinder
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