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256g of a mixture of methane and acetylene burn in oxygen to produce 1160g of carbon dioxide and water. What was the initial mass of each reactant?
The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 degrees celcius is 410 s, what is the value of the rate constant k
25.0mL of a 0.100M solution of NH3 is titrated with 0.150M HCl. After 10.0mL of the HCl has been added, the resultant solution is: a) basic and before the equivalence point
a a graduated cylinder with 18 ml of water will contain18gm of water which equals one mole of water molecules. if each
Suppose a solution contains 0.25 M Pb2 and 0.49 M Al3 . Calculate the pH range that would allow Al(OH)3 to precipitate but not Pb(OH)2
What volume will 500 mL of gas at 20°C and a pressure of 420 mm Hg occupy if the temperature is reduced to -80°C and the pressure is increased to 650 mm Hg?
Use Hess's law and the measured mean enthalpy changes for the NaOH-HCl(36.2) and NH3-HCl(31.9) reactions to calculate the enthalpy change to be expected from the reaction: NaOH + NH4Cl----NaCl + NH3 +H2O
If the 4.00g sample corresponds to 0.0666 moles of a compound, what is the molecular formula of the unknown molecule (CxHyOz)
Barbituric acid (ka = 1.1x10^-4) is used in the manufacture of some sedatives. For a 0.6733 M solution of barbituric acid, calculate
Draw the structures of the E and Z stereoisomers of 1,4-diphenyl-2-butene-1,4-dione and label which is the cis and which is the trans
Calculate the solubility of Ba(IO3)2 in 0.033 M solution of Mg(IO3)2 considering both the electolyte and common ion effects. Ba(IO3)2 Ksp
Lucite is 71.4% carbon, 9.59% hydrogen, and 19.01% oxygen. What is the empirical formula for Lucite?
a solution of 75 ml of 0.2 m nh3 is titrated with 50 ml of 0.5 m hno3. what is the ph of the resulting solution when 17
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