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A tank contains helium gas at 576 mmHg, nitrogen gas at 1.57 atm, and neon at 730 torr. What is the total pressure in atm?
The heat of vaporization, ?Hvap, of a certain liquid at 25oC is 77.8. kJ/mol. If one mole of the liquid has an entropy of 247 J/K, what is the entropy of one mole of the vapor in equilibrium with the liquid at this temperature
Given that 3.582 g of copper (II) chloride are dissolved in 2.478 litres of deionized water, answer the following: 1) How many moles of copper (II) ions are present in the sample
what is the concentration of toluene in the air space of the bottle and what is the concentration of toluene in the water? The dimensionless Henry's Law Constant for toluene at 25 degrees C is 0.265 (mg/Lair)/mg/Lwater).
calculate the initial reaction rate when [O3] & [NO] remain essentially constant at the values [O3]0= 7.48 x 10-6 M & [NO]0= 3.26 x 10-5M
Explain which of the subsequent reagents would work best to separate Ba(2+) and Ca(2+) from a solution that is 0.050 M in each ion. Explain. (a) 0.10 M NaCl (b) 0.05 M Na2SO4 (c) 0.001 M NaOH (d) 0.50 M Na2CO3
The vapor pressure of dichloromethane, rm CH_2Cl_2, at 0 rm ^{circ}C is 134 rm mmHg. The normal boiling point of dichloromethane is 40. rm ^C. Calculate its molar heat of vaporization.
the active ingredient in aspirin is acetylsalicylic acid hc9h7o4 a monoprotic acid with ka 3.3 x 10-4 at 25 degrees c.
A lithium atom has the electron configuration: 1s2 2s0 3s0 3p1 (excited state). Would the "ground state" for the excited electron in the 3p orbital be in n=2 since the n=1 state is full?
the distance between the atoms of H-I is 1.61 A. What is the distance in meters. What is the charge associated with each side of the HI molecule
A. Why is it useful to know the melting point and/or boiling point of a substance? B. How would you determine the melting of a substance whose melting point is higher than 100°C?
Which formula represents the greatest number of isomers?
calculate the final temperature when a 25.5 gram sample of ice at 0oc is placed into a styrofoam cup containing 116
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