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A hydrocarbon is found by combustion analysis to contain 87.17% carbon and 12.83 hydrogen by mass. Determine the smallest possible molecular formula for this compound.
Elements are always arranged in order of increasing atomic weights. Metallic properties increase going from bottom to top in a family of elements.
what mass of ethanol ch3ch2oh should be dissolved in 450. g of water to obtain a freezing point of
two gas tanks are linked by a connecting tube of negligible volume with a valve. one contains 15 l of nitrogen at 7.2
Calculate the average value of the cosine of the angle between the electric field direction and the molecular dipole, , of a collection of molecules each with a dipole moment,µ=1.0 x 10-29 Coulomb meters
1.285g sample of Na2SO4 is exposed to the atmosphere and found to gain 0.393g in mass. What is the percent, by mass, of Na2SO4*H2O in the resulting mixture of anhydrous Na2SO4 and the decahydrate
Correct for the water vapor present in the wet dry ice experiment and compare and compare with the mean value for the dry ice experiment. Does the presence of water vapor affect the result?
what will be the temperature of the system when equilibrium is established? Â (sp Heat of H2O(s) = 2.09j/g . c (sp heat of H2O (l) = 4.18 J/g.c) Heat of Fus. of H2O(s)=333j/g
A sample of gas inside a 150 mL piston has an initial temperature of 550 K and pressure of 8.0 atm. As the piston expands to 650 mL, the pressure decreases to 1.5 atm.
A student mixed 50.0 mL of 0.50 M H2SO4 (aq) at 18.5 degrees C with 100 mL of 0.50 M NaOH (aq) at the same temperature. After the reaction was completed, the temperature rose to 22.0 degrees C. What was the heat of reaction? (Assuming the densitie..
At low temperatures, xenon freezes to a solid having a density of 5.653 g/cm3. Below 84 K, argon also freezes to a solid that has a similar structure but different volume and mass.
Calculate the molar concentration of HCl in a solution that has a specific gravity 1.185 and is 36.5% (w/w). Prepare from this bottle 1 L of 0.1 HCl solution. 25 mL of this solution titrated with 30 mL of NaOH.
why is it important to standardize NaOH solution instead of taking an accurate and diluting it in a volumetric
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