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A 1.4639g sample of limestone was analyzed for Fe, Ca, and Mg. The iron was determined as Fe2O3, yielding 0.0357g. Calcium was isolated as CaSO4, yielding a precipitate of 1.4058g, and Mg was isolated as 0.0672g of Mg2P2O7. Report the amount of Fe, Ca and Mg in the limestone sample as % Fe2O3, %CaO and %MgO.
Describe the following combinations as either soluble or insoluble. 1. Sand sinks to the bottom of a beaker of water. 2.Antifreeze and water mix completely. 3. Benzene, a liquid, floats on the surface of water.
The initial rates at various substrate concentrations for an enzyme-catalyzed reaction are as follows. [S]/M.............Vo/10^-6 M/min 2.5x10^-5.......38.0 4x10^-5.........53.4 6x10^-5.........68.6 8x10^-5.........80.0 16x10^-5.......106.8 20x10^..
Calculate the molar mass of the unknown gas. (Remember that the faster the rate of effusion, the shorter the time required for effusion of 1.0 L; that is, rate and time are inversely proportional.)
A copper wire (density = 8.96 g/cm3) has a diameter of 0.18 mm. If a sample of this copper wire has a mass of 33 g, how long is the wire?
What is the relationship between the structures of esters and their odors. What is the relationship between the structures of esters and the carbonyl peaks from IR spectra
Urea (NH2CONH2) an important nitrogen fertilizer is produced industrially by the reaction 2NH3(g)+CO2(g)--->NH2CONH2(aq) + H2O(l) given that ?G^degree = -13.6KJ, calculate
What is the total sample size (in grams) for a sample of disulfur octoxide which contains 3.52 g of oxygen.
a baseball weighs 5.19oz. what is teh kinetic energy in joules of this baseball when it is thrown by a major-league pitcher at 95 mph?
Another hypothetical molecular compound, Y 2(g), has a bond energy of 750 kJ/mol, and the molecular compound XY(g) has a bond energy of 1500 kJ/mol. Using bond-energy information, calculate ?H for the following reaction:
How many grams of chlorine gas must be reacted with excess sodium iodide if 20.0 moles of sodium chloride are needed?
A light year is the distance light travels in 1.00 year. Given the velocity of light 1.86x10^5 mi/s. How many miles does the light travel in a light year
determine the mass of each of the following salts required to form a saturated solution
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