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400 M formic acid (HCOOH) solution freezes at -0.758 degrees C. Calculate the Ka of the acid at that temperature. (hint: assume that molarity is equal to molality. Carry out your calculations to three sig figs and round off to two for Ka).
Which of the following molecules have dipole moments? For the molecules that are polar, indicate the polarity of each bond and the direction of the net dipole moment of the molecule.
What is the molarity of a solution formed by mixing 20.0 g sulfuric acid with enough water to make 500.0 mL of solution?
There is a relatively constant amount of carbon-14 in living (breathing) things on Earth. Upon death of the plant or animal ,the amount of C14 in the organism decreases, according to the kinetics of first-order decay, A?products.Carbon dating is a..
What is the freezing point of a solution of 1.17 g of 1-naphthol, C10H8O, dissolved in 2.00 mL of benzene at 20°C? The density of benzene at 20°C is 0.876 g/mL. Kf for benzene is 5.12°C/m, and benzene's normal freezing point is 5.53°C.
Calculate the pH of a solution prepared by mixing 50mL of a 0.10 M CH3NH2 solution with 25mL of a .20M HCl solution. (Kb CH3NH2 = 4.4 x 10^-4)
calculate the mass of a sample of gold that occupies 5.0 X 10^-3 cm3 if the density of gold is 19.3 g/cm
Why do you sweat? Please use all the thermochemical terminologies( endothermic, exothermic, eat transfer, and whatever else is appropriate)
What is the difference between selectivity and sensitivity as these words pertain to sensors? Why or why not would you want a very sensitive sensor?
a 12.6 g sample of NH4NO3 is dropped into a constant-pressure calorimeter containing 175 g of water at 23.5 C. What temperature will the water reach, assuming that the calorimeter container does not gain or lose any heat?
Calculate the partial pressure of each gas and the total pressure if the temperature of the gas is 21 degrees Celcius.
Suppose a mercury thermometer contains 3.450 of mercury and has a capillary that is 0.180 in diameter. How far does the mercury rise in the capillary when the temperature changes from 0.0C to 25.0 C? The density of mercury at these temperatures is..
Need to dissolve CaCl2 in water to make a mixture that is 28.0% calcium chloride by mass. If the total mass of the mixture is 884.7 g,
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