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You need to produce a buffer with pH = 4.1 by dissolving a weighed amount of sodium formate (FW = 68.0072) in 500-mL of 0.45-M formic acid
a) What mass of sodium formate is required?
A 325-mL sample of solution contains 25.3 g of CaCl2, which is fully dissolved. (a) Calculate the molar concentration of Cl- in this solution. (b) How many grams of Cl- are in 0.100 L of this solution?
Wpump = 1500 kJ/h = 0.42 kW Qboil = 2.59 x 106 kJ/h = 718.7 kW Wturb = -227,300 kJ/h = -63.1 kW Qcond = -2.36 x 106 kJ/h = -656 kW What is the efficiency of the engine? How should we define it?
M HNO3 is mixed with 439 mL NaOH with pH=13.97. What is the pH of the resulting solution?
calculate the theoretical mass of nylon 6,10, in order to find out the percent yield. - 1mL of sebacyl chloride was used (density = 1.121g/mL) and 2.3 grams of 1,6 hexanediamide
which of the following aqueous solutions will freeze at the lowest temperature? a. 0.10 m KCl, b. 0.20 m C6H12O6 (glucose), c. 0.050 m AlCl3, d. 0.15 m SrBr2, e. all of the above freeze at the same temperature
We have a refrigeration unit that works at a pressure of 0.1MPa in the evaporator and 1 MPa in the condenser. The refrigeration unit uses a compressor with an efficiency of 90% and a turbine with 100% efficiency is used to expand the refrigerant a..
Propose a synthesis of 1,2-butanediol from ethyne as the only organic starting material. Your ethyne supply may be split to make different intermediates that, in turn
What is the volume of the air space when the bell has been lowered to a depth of 50m? Take the density of sea water to be 1.025gcm^-3 and assume that the temperature is the same as on the surface
which pair of compound form a hemiacetal.
A pound of coffee beans yields 54 cups of coffee (4 cups = 1qt ). How many milliliters of coffee can be obtained from 1g of coffee beans?
What is the percent hydrogen (H) by weight of a solution containing 53.5mL of CH3COCH3? The density of acetone is 0.788 g/mL.
How many grams of formic acid, HCOOH, must be added to 0.300 L of 0.190 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.00? Assume no volume change. Ka of HCOOH = 5.0 10-4.
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