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When 0.848 g of finely divided iron is burned, 1.212 g of a reddish brown oxide is obtained. Write a balanced chemical equation for the reaction of iron and molecular oxygen based on the empirical formula.
Although the viscosity varies over a factor of more than two in the series from hexane to nonane, the surface tension at at 25 degrees Celsius increases by only about 20% in the same series. How do you account for this
A graduate student was studying enzymatic reduction of cyclohexanones. When the NADPH enzyme was used to reduce the following compound an optically active product was produced.
The half life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope?
What is the change in the volume of the balloon as it ascends to 7000ft?
Lakes that have been acidified by acid rain can be neutralized by the addition of limestone (CaCO3). How much limestone in kilograms would be required to completely neutralize a 5.2*10 - L lake containing 5.0? * 10-³ of H2SO4 per liter
A 50.0 ml sample of benzene at 16.9 degrees C was cooled to its melting point, 5.5 degrees C and then frozen. How much heat was given off in this process
The Atomic Mass of carbon is found to be 12.011 amu. A Molecular Mass is the sum of the (averaged) Atomic Masses for all atoms in a molecule. What is the Molecular Mass of H2SeO3
Calculate the mass of TRIS to use when it is mixed with 100 mL of 0.50 M HCl to prepare 1.00 L of buffer of pH=7.40. Also calculate the total concentration of the buffer.
Why does clove oil float on the surface of the aqueous distillate rather than sinking to the bottom?
The weight of the initial mixture is 5.020 g, and the weight of the resulting anydrous compounds is 2.988 g. Which choice is closest to the percent by mass of copper(II) sulfate pentahydrate in the original mixture? Steps?
A sample of helium gas has a volume of 8.23 L at 258.8 K and 2.049 atm. How many helium molecules does it contain
Complete and balance the following equation Write the ionic equation and net ionic equation. Indicate spectator ions and determine if a precipatie would form. (NH4)2C03(aq)+CaCl2
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