@X@user.full_name@X@ @GMU: What is the fraction of A remaining after 79.649 minutes if the first order rate constant is 2.191e-4 s-1?

@X@user.full_name@X@ @GMU: When 2.713 g of urea was dissolved in 107.3 g of benzene, the boiling point was 354.3 K. What is the formula mass of this compound? The boiling point elevation constant for benzene is 2.53 (°C*kg)/mol. The melting point and boiling points are 5.50°C and 80.10°C, respectively.

@X@user.full_name@X@ @GMU: What is the potential of a cell at 25oC for which the reaction below applies, if the molar concentrations of Fe3+(aq) and H+ are 0.133 M and 1.06e-5 M, respectively? The H2(g) pressure is 1 atm at 25oC.6H+(aq) + 2Fe(s) → 2Fe3+(aq) + 3H2(g) Ecoell = 0.040 V

@X@user.full_name@X@ @GMU: The vapor pressure of benzene, C6H6, (l) at 320.2 K is 257.9 mm Hg. What is the heat of vaporization if its normal boiling point is 353.3 K?

@X@user.full_name@X@   @GMU: To what temperature would the reaction below need to be heated to have a rate constant of 6.09e-4 M-1s-1 if the rate constant was 2.700e-4 M-1s-1 at 327.00°C and the activation energy was 166.00 kJ/mol?H2(g) + I2(g) → 2HI(g)

@X@user.full_name@X@ @GMU: Determine the molality of a 6.932 wt % aqueous solution of LiCl.

@X@user.full_name@X@ @GMU: What is the correct expression for the solubility product of lead chromate?PbCrO4(s) → Pb2+(aq) + CrO42-(aq)

@X@user.full_name@X@ @GMU: How much time in minutes would it take for a 1.9957 g sample of 33P to decay to a mass of 1.1357 g if it has a half-life of 2.160e6 s.

@X@user.full_name@X@ @GMU: The osmotic pressure of a 15.060 mM solution of CaCl2 is 589.249 mm Hg at 29.76 °C. How many ions per formula unit of CaCl2 must there be? The compound may not be completely ionic.

@X@user.full_name@X@ @GMU: The osmotic pressure of a 14.019 mM solution of Fe(NO3)3 is 0.924 atm at 28.97 °C. How many ions per formula unit of Fe(NO3)3 must there be? The compound may not be completely ionic.