Sunday
November 23, 2014

Posts by Bru


Total # Posts: 7

chemistry
calculate the standard molar entropy change for the combustion of methane gas using S naught values from standard thermodynamic tables. Assume that liquid water is one of the products.
October 5, 2012

chemistry
nevermind, I got it. Is the answer 160 g/mol?
October 2, 2012

chemistry
What do you mean solve for molar mass? I think that is the problem that I am having.
October 2, 2012

chemistry
A 250.0 mL sample of an aqueous solution at 25 degrees Celsius contains 35.8 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 11.25 mmHg, what is the molar mass of the unknown compound? a.) 237 g/mol b.) 484 g/mol c.) 351 g/mol d.) 699 g/mol...
October 2, 2012

chemistry-lattice energy
Determine the lattice energy for CaBr2 if the enthalpy of solution for CaBr2 is -145 kJ/mol, and the heats of hydration for Ca2+ and Br- are -1650 kJ/mol and -292 kJ/mol respectively.
October 1, 2012

chemistry
So you invert the equation to M=pi/RTi to solve for Molarity. I plug in the numbers ((0.1480 atm)/(0.08206 L atm/K mol)(298K) (1)) That equals 6.1554*10^-4 mols. Dont you divide 0.358g/6.1554*10^-4??
September 30, 2012

chemistry
a substance has a vapor pressure of 35.0 mmHg at 52.0 degrees Celsius and 70.0 mm Hg at 77.0 degrees Celsius. What is the heat of vaporization for this substance?
September 30, 2012

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