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When a 8.37-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 445.8 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture? The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1, respectively.
Use atomic masses accurate to four significant digits in your calculations.Enter your answer with 2 significant digits.Enter only numbers in your answer.
given that the density of elemental mercury is 13.534g/mL, how many atoms of mercury are contained in 1.500mL of element?
Why is it possible to separate the product (6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone) from sodium hydroxide using acetone?
A sample containing 4.80 g of gas has a volume of 15.0 L. Pressure and temperature remain constant. What is the new voume if 0.500 mole gas is added?
If 95.0 mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m.
nitric acid and potassium carbonate. b. sodium bromide and lead nitrate. c. acetic acid and calcium hydroxide.
After calculating their boiling points, place the following aqueous solutions in order of highest boiling point to lowest boiling point. You must show all work in detail to receive credit: 0.1 m NaCl, 0.05 m Na2S, 0.08 m C6H12O6
Determine the pH of an aqueous solution of CaCO3 that contains 1.7*10^-6 M of hydroxide ion [OH^-].
The temperature changes from 25 degrees C to 29 degrees C. What is the enthalpy (ΔH) of the reaction? (use 4.184 J/g degrees C as the specific heat of water)
if 19.65mL of .145M nitric acid is required ti neutralize 50.0mL of barium hydroxide what is the molar concentration of the base? 2HNO3+Ba(OH)2-->Ba(NO3)2+2H2O
the active ingredient in toothpaste is sodium fluoride, an anticavity agent. a 170 g tube of toothpaste lists the concentration of sodium fluoride a s0.24%. how many grams of sodium fluoride are in a toothpaste.
what is the correct electron configuration for Cr (chromium). Chose the proper Lewis dot structure for the compound or poliatomic ion: Sulfur Dioxide (SO2).
What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical reaction?
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