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A 265- flask contains pure helium at a pressure of 757 . A second flask with a volume of 485 contains pure argon at a pressure of 714. what is the partial pressure of helium.
A certain solvent has a normal freezing point of 1.72 ° C, and a freezing point depression constant of 5.07 ° C/m. What is the molality of a solution in
Most community water supplies contain 0.5 ppm chlorine added for purification. What mass of chlorine must be added to 1500. L of water to reach this level. (Hint: the density of water is 1.00 g/mL)
The vapor pressure of dichloromethane,CH2Cl2, at 0 C is 134 mmHg. The normal boiling point of dichloromethane is 40 C. Calculate its molar heat of vaporization.
delta H = -174 kcal/mol (-728 KJ/ mol) methanol for the process. How many kilocalories are released by burning 2.00mol of methanol? 3- How many kilojoules are released by burning 55g of methanol?
however, it takes more CaCl2 to form a White solid in one of the solutions than the other. Using the data from your experiment to help, explain what is happening when CaCl2 is reacted with the NaHCO3 (aq) or Na2CO3 (aq) solutions.
A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives
An equilibrium mixture of this reaction(NH4HS(s)?NH3(g)+H2S(g)) at a certain temperature was found to have [H2S]= 0.350M and [NH3]= 0.276M .What is the value of the equilibrium constant (Kc) at this temperature.
Cinnamon gets some of its flavor from cinnamaldehyde that is 81.79% C; 6.10% H and the rest is oxygen. Determine the empirical formula for this compound (enter your answer in the form CxHyOz)
A 530. g piece of copper tubing is heated to 89.5°C and placed in an insulated vessel containing 159 g of water at 22.8°C. Assuming no loss of water and heat capacity for the vessel of 10.0 J/K
Calculate the equilibrium constant at 0c and at 50c(assuming enthalpies of formation are independent of temp)
A thermos bottle containing milk is shaken vigorously. Consider the milk as the system. (a) Will the temperature rise as a result of the shaking? (b) has heat been added tot he system? (c) Has work been done on the system? (d) Has the system's int..
The atmospheric activity of 14 C is 15 cpm/gC (counts per minute per gram of carbon). Assume that the cloth was made in the year 24 B.C. The half-life of 14 C is 5730 years. What will be the expected activity of 14 C of this sample
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