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What is the molar mass of a nonpolar molecular compound if 5.52 grams dissolved in 36.0 grams of benzene begins to freeze at -1.87oC? The freezing point of pure benzene is 5.50 oC and the freezing point depression constant, Kfp, is -5.12oC/m."
Determine the vapor P lowering, freezing point depression, boiling point elevation, and osmotic pressure when the sample is dissolved in 10.0 g water
Osmosis occurs when the solvent molecules move from a solution of higher solute concentration to a solution of lower solute concentration.
A 100.0-g sample of water at 27.0 oC is poured into a 77.4-g sample of water at 89.0 oC.What will be the final temperature of the water?
The specific heat of lead is 0.0380cal/g degree celcius. If 47.0 calories of energy raised the temperature of a lead sample from 28.3 degrees celcius to 30.1 degrees celcius.
what is vapor pressure in mmhg of a solution prepared by dissolving 5.00 g of benzoic acid in 100g of ethyl alcohol at 35 degrees celcius? the vapor pressure of pure ethyl alcohol at 35 degrees if 100.5 mmHg
How could you be certain a peak in the soda was caffeine and not another substance with similar retention time
The voltage across the leads of a glass pH-reference combination electrode immersed in a solution of pH 8.00 was 133 mV. Calculate the expected voltage if the pH of the solution is raised to 9.00
For the following hypothetical elementary step reaction at equilibrium: A in equilibrium with B, and from the ARrhenius equation k= A e^(-Ea/RT), derive the equation : Ln(K1/K2)= delta H/R(1/T2 - 1/T1) in any one of it's forms.
A 100. mL sample of 0.10 M HCl is mixed with 50. mL of 0.12 M NH3. What is the resulting pH?(kB FOR NH3= 1.8 x 10^-5)
a compound contain 60.87 carbon 4.38 hydrogen and 34.75 oxygen then determine its empirical formula?cof2carbonyl
If 67.0 mL of 0.119 mol/L NaOH(aq) and 35.0 mL of 0.193 mol/L HA(aq) are mixed, then what is [HA] at equilibrium? Assume that HA is a weak monoprotic acid with pKa=6.23 at 25oC.
a) What is the mo;ar mass of the gas b) If the unknown gas is composed of 2.78 g of carbon and the rest is hydrogen, what is its molecular formula
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