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WO3+3H2-->W+3H2OExplain how many grams of tungsten trioxide must you start with to prepare 4.90 g of tungsten?
A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q.
a steel reaction vessel has a movable piston that is set to allow an enclosed sample of gas expandnbspand contract
Suppose you are given 150 mg of an unknown mixture that contains three compounds, and you are told to separate the compounds using column chromatography, using alumina as a stationary phase. How would you decide what solvent or solvent system to u..
Explain why adding excess of sulfuric acid to the solution from which crystallization of alum is to take place helps to suppress the hydrolysis of Al3+
The equation for the combustion of gaseous methanol is: 2CH3OH(g) + 3O2(g) ? 2CO2(g) + 4H2O(g) Estimate the ?H°rxn per mole of methanol combusted, using the bond energy data provided below
what mass of carbon should be produced if the tums were pure calcium carbonate? this is theoretical yeild. equation
When 20.0 grams of an unknown compound are dissolved in 500. grams of benzene, the freezing point of the resulting solution is 3.77°C. The freezing point of pure benzene is 5.48°C, and Kf for benzene is 5.12°C/m. What is the molecular weight of th..
the chloride of an unknown metal is believed to have the formula mcl 3. a 1.891g g sample of the compound is found
A sample of molten iron occupies of a volume of 7.11 x 10-3 L. If the density of iron is 7.86 g/cm3, what is the mass of iron in grams in the sample?
Enthalpy of combustion of ethanol(g) is -1371 kJ/mol. Temperature and pressure of intake mixture is 25 oC and 1 bar, respectively. Assume ideal behavior of diatomic gas and ignore the changes in the number of moles of gas during combustion.
12.00 g of an unknown nonelectrolyte in enough water to make 2.00 L of solution. The osmotic pressure of this solution is 0.750 atm at 25.0°C. What is the molecular weight of the unknown solute (R = 0.08206 L•atm/K•mol)
A dryer removes 20,000 lb/hr of water from paper. Air at 70 deg F and 50% Relative Humidity enters and leaves the dryer at 140 deg F at 80% Relative Humidity. The barometric pressure is 14.3 psi. Calculate the total air flow to this dryer (ft^3/mi..
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