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-The salting coefficient for H2CO3 in seawater is about 0.075. If a seawater sample has an ionic strength of 0.70 M, what is the activity coefficient for H2CO3?
-A buffer has been prepared by mixing 250-mg NH4Cl and 200 mL of 0.1 M NH3solution. What is the pH of this after 10 mL HCl has been added? The addition of the acid dilutes the mixture to 250 mL.
A sample of NH4HS is placed in an evacuated container as well as allowed to come to equilibrium. The partial pressure of NH3 is then raised by the addition of 0.590atm of NH3. Explain the partial pressure of H2S at equilibrium is now what atm
What volume of .2 M Na2SO4 will completely react with 50 mL of .135 M Ba(NO3)2
A solution is prepared by mixing 5.00 g of compound Z (molar mass 15.00 g/mol) in 100.0 ml of water. The density of the solution is 1.09 g/ml. Calculate the molarity of the solution.
the concentration of cholesterol in the blood serum of a normal adult is approx 200mgdl. how many grams of cholesterol
At 131 celsius and 769 mmHg, 2.00 L of the gaseous compound weighs 4.44 g. What is the molecular formula for the compound?
A beaker with 115 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 5.70 mL of a 0.480 M HCl solution to the beaker.
small samples of oxygen gas needed in the laboratory can be generated by any number of simple chemical reactions such
How much heat is absorbed by a 125g sample of water when it is heated from 25.200C to 32.800C? The specific heat of water is 4.184 J/g0C.
Which of the following solutions is a good buffer system? A) A solution that is 0.10 M HF and 0.10 M NaC2H3O2 B) A solution that is 0.10 M NaOH and 0.10 M KOH C) A solution that is 0.10 M HC2H3O2 and 0.10 M NaC2H3O2 D) A solution that is 0.10 M HC..
A solution of ethanol (C2H5OH) in water is prepared by dissolving 56.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 255.0 mL of solution. What is the molarity of the ethanol in this solution?
What is the empirical formula of a potassium silicate in which the silicate tetrahedral share (a) two 0 atoms and form a chain or (b) three 0 atoms and form.
The vapore pressure of water at 16 degree celsius is 13.6 torr and it is 15.5 torr at 18 degree celsius. what is the vapore pressure at 17 degree celsius
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