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A biochemical engineer isolates a bacterial gene fragment and dissolves a 13.1 mg sample of the material in enough water to make 39.3 mL of solution. The osmotic pressure of the solution is 0.340 torr at 25°C.
(a) What is the molar mass of the gene fragment?(b) If the solution density is 0.997 g/mL, how large is the freezing point depression for this solution (Kf of water=1.86°C/m)?
Which one is pure of the following; Bronze and brass, Sugar, carbon dioxide and water, Soda water and brass, Gasoline
A solution is made by dissolving 25g of NaCl in enough water to make 1.00 L of solution. Assume that the density of the solution is 1.00 g/cm3. Calculate the mass percent, molarity, molality, and mole fraction of NaCl
Which state in each of the following pairs has the higher entropy per mole of substance. 1. Ice at - 40 degrees C or ice at 0 degrees C 2. N2 at STP or N2 at 0 degrees C and 10 atm 3. N2 at STP or N2 at 0 degrees C in a volume of 50 L 4.
What is the rate constant of a first-order reaction that takes 367 seconds for the reactant concentration to drop to half of its initial value
The ketone used was cyclopentanone and the aldehyde used was benzaldehyde. First cyclopentanone was dissolved in 95% ethanol. Then benzaldehyde was added along with NaOH to the mixure. The solution was then mixed creating the aldol condensation pr..
a sample of gas has a volume of 0.106 L at 37 degrees Celsius and 0.920 atm. what is the volume of stp (1 atm and 0 degrees Celsius)
Calculate the mass of iodine that will react completely with 40.0 g of aluminum (Al) to form aluminum iodid (AH3)
Important information about Galvanic cell, Consider a galvanic cell consisting of Sn wire immersed in a solution containing 10^-10 M Sn(NO3)subscript 2 and 1 M HNO3 and Ag wire immersed in 10^-2 M AgNO3 and 1 M HNO3.
What is the molar mass of a nonelectrolyte compound if 3.42 grams of the compound dissolved in 41.8 grams benzene begins to freeze
The ionization constant Ka of benzoic acid is 6.3x10^-5. calculate th equilibrium concentrations of H+, benzote anion and benzoic acid. The initial concentration of benzoic acid is .10 M.
At 40°C, the vapor pressure of heptane is 92 torr. If a solution is made of naphthalene in heptane and has a vapor pressure of 82 torr, what is the mole fraction of naphthalene? Assume ideal solution behavior.
Each hemoglobin combine with 4 O2. If 1.02 g of hemoglobin combine with 1.6 ml of O2 at 37degree c and 724torr. What is the molar mass of Hemoglobin
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