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calculate the molar absorptivity (epslion) of Cu2+ at 620nm given that the curvettes used in lab had a pathlegth of 1.00 cm. please use beers law. y=1.50x + .0109 (calibration curve)
a gas company in massachusetts charges $2.80 for 15ft^3 of natural gas at 20 degrees C and 1 atm. Calculate the cost of heating 200mL of water from 20 degrees C to 100 degrees C.
calculate the potential of a platinium electrode immersed in a solution prepared by mixing 25.00ml of 0.0918 M SnCl2
The pressure is steeply increased to 100 bar. The volume of the liquid is decreased by 1 ml at this constant pressure. Find the deltaH and deltaU
A tank of hydrogen has a volume of 22.9 L and holds 14.0 mol at 12.0 C, what is the pressure of the gas in atm
what are the differences in the type of inhibition caused by heat, acid or base, and heavy metal ions on enzyme activity?
A current of 11.3 A is applied to 1.25L of a solution of .552M HBr converting some of the H+ to H2(g).
What is the FORMULA for the limiting reagent? What is the maximum amount of carbon dioxide that can be formed in grams? What amount of the excess reagent remains after the reaction is complete in grams?
Determine the ionization energy (in kilojoules per mole) of a metallic element if light of wavelength 67.2 nm ejects electrons with a speed of 2165 km/sec.
What is the density of a block of marble that occupies 253 cm3 and has a mass of 752 g?
Siver nitrate is sadded to a solution containing an unknown salt. An off-white colored precipitate forms. Nitric acid is added to the mixture, the precipitate dissolves and a gas is given off. What is the anion present: Cl-, Br-, I-, PO4 3-, SO4 2..
Calculate the mass percent of methanol, ethanol, and MTBE, that must be present in gasoline to yield a mixture of 1.8% oxygen by weight.
Determine How many moles each of Na+ and Cl- are in 0.800 L A physiological saline solution contains 172mEq/ L each of Na+ and Cl-of the saline solution?
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