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A particular gaseous hydrocarbon that is 82.7% C and 17.3 % H by mass has a density of 2.36 g/L at 21 degress C and 749mmHg .
What is the molecular formula of this hydrocarbon?
The enthalpy change when 1 mol methane (CH4) is burned is -890 kJ. It takes 44.0 kJ to vaporize 1 mol water. What mass of methane must be burned to provide the heat needed to vaporize 1.00 g of water
Describe the effect that the following procedural changes would have on the percent recovery of acetanilide. Rather than adding 0.5ml portions of boiling solvent to acetanilide, student added 5ml portions
What hybridization would you expect for the indicated (bold) atom in each of the following molecules?
Calcium has a work function of 4.64x10^-19 J. Which of the following wavelenghts will eject electrons from calcium
A certain reaction with an activation energy of 185 kJ/mol was run at 485K and again at 505K. What is the ratio of f at the higher temperature to f at the lower temperature
What is the expected Nernst responce, in mV, for each decade change in the gydrogen ion concentration for a glass electrode
A bottle containing 305 g of cleaning solution is used for carpets. If the cleaning solution has a specific gravity of 0.850, what volume of solution was used?
WHen 1.187g of a metallic oxide is reduced with excess hydrogen, 1.054g of the metal is produced. What is the metallic oxide
A certain first-order reaction has a rate constant of 2.30×10-2 s^-1 at 23 C. What is the value of k at 55 C if Ea= 84.0 kj/mol
Balance the chemical equation given below, and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25°C
(a) How many mL of KOH will it take to reach the equivalence point? (b) Calculate the pH at the equivalence point. The Ka of HClO is 3.8 x 10-8.
State the equilibrium concentration of each component that makes the solution a buffer solution. Ka = 1.8 x 10-5 for acetic acid.
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