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The vapor pressure of pure water at 25 C is 23.8 torr. A solution is made by mixign 36.38 g of unknown non ionic substance into 250.00 g of water and the vapor pressure of the solution is found to be 23.1 torr. What is the molecular weight of the solution?
one type of sunburn occurs on exposure to UV light of wavelength in the vicinity of 325nm.
Draw the molecular orbitals for the following molecules CH20. Label the hybridization of all non-hydrogen atoms
Calculate Delta mixG, Delta mixS, and Delta mixH for mixing 150.0 g of benzene with 200.0 g of toluene at 20 degree C and 1 atm.
Radiochemical techniques are useful in estimating the solubility product of many compounds. In one experiment, 50.0 mL of a 0.010 M AgNO3
nitrogen and hydrogen gases react to form ammonia gas as followsn2g3h2g--gt2nh3gat a certain temperature and pressure
Calculate the potential E for the following cell: Fe(s)| Fe(NO3)2 (0.050M || Cu(NO3)2 (0.020 M) | Cu(s) Cell reaction: Cu+2 + Fes ? Cus + Fe+2 Fe+2 + 2e- ? Fe(S) Eo = -0.44 V Cu+2 + 2e- ? Cu(s) Eo = 0.339V
At 20 degrees C, 0.164 mg of H2 dissolves in 100.0 g of water when the H2 pressure above the water is 1.000 atm. Find the Henry's law constant for H2 is water at 20 degrees C.
the frequency factor a is 8.7x 10 12 s- and the activation energy is 63 kj/mol, What is the rate constant for the reaction at 75C
How many mL of 12.0 M HCl should be added to 500 mL of 0.100 M Na2SO3 (Kb2 = 8.13 x 10-13 and Kb1 =1.5 x 10-7) to produce a buffer at pH of 7.00?
Calculate the vapor pressure of Hg at 86 oC (in atm). Hg(l) ? Hg(g) ?Ho = 61.32 kJ and ?So = 98.83 J/K
In this experiment we reduced methylene blue with ascorbic acid using HCl as a catalyst. Given that the half reaction for the reduction of methylene blue is MB+(ox) +2H +2e -----> MBH2
The sensitivity of a fluorescent sensor can be adjusted by either selecting luminophores with different lifetimes or by modifying the supporting media. Explain why both of these methods are effective.
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