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The concentration fo certain sodium hydroxide solution was determined phthalate(abbreviated as KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titrationm 34.67
What will be the heat capacity (in units of J/K) of a constant pressure, coffee-cup calorimter that contains 100.0 mL of 3.0 M HCl solution?
How many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?
At ordinary body temperature (37 ) the solubility of in water in contact with air at ordinary atmospheric pressure (1.0 ) is 0.015 . Air is approximately 78 % .
A chemist studying the properties of photo- graphic emulsions needed to prepare 500 mL of 0.18 M AgNO3 (aq). What mass of silver ni- trate must be placed into a 500 mL volumetric&
The vapor above a mixture of pentane and hexane at room temperature contains 35.5 pentane by mass. What is the mass percent composition of the solution?
What will the volume of the sample become if 459 mL of an ideal gas at 27 degrees of Carbon and 1.05 atm is cooled to 15 degrees of Carbon and 0.997 atm?
Pure liquid octane (d = 0.709 g/mL) is used as the fuel in a test of a new automobile drive train. How much energy (in kJ) is released by complete combustion of of all the octane in a 16.5 gal fuel
You have 75.0 mL of a 2.50 M solution of Na2CrO4(aq). You also have 125 mL of a 1.79 M solution of AgNO3(aq). Calculate the concentration of CrO42- after the two solutions are mixed together.
You then add a volume of HCl exactly equal to ½ the volume of NaOH actually used in the titration. What effect does this have on the Ka.
An object made of aluminum has a mass of 8.37g. When it was placed in a graduated cylinder containing 20.0mL of water, the water level rose to 23.1mL. Calculate the density and specific gravity of t
Determine the density in g/mL of a 0.70 g sample of oxygen gas that occupies 5.0L. Compare the density of oxygen gas to the density of water, assuming both substances are at STP.
A graduated cylinder contains 10.0ml of water. If the volume of a single water molecule is 2.99 x 10e-23 cm e3, how many molecules are in the graduated cylinder?
Suppose that none of the energy was stored in his body. What mass (in grams) of water would he need to perspire in order to maintain his original temperature?
Suppose a can contains a residual amount of gas at a pressure of 755 mm Hg and a temperature of 25 °C. What would the pressure be if the can were heated to 1155 °C?
Explain the significance of the chromic acid test. What would you observe in the case of a positive result? Do you expect 9-fluorenol to give a positive or negative result? What about the 9-fluoreno
When 2.00 moles of H2O react, how many grams of NH3 are produced?
Balance the following equation. What is the amount of Cu (in grams) necessary to precipitate 0.50 g of Ag in the presence of excess AgNO3?
to heat 236mL of water from 25 degrees celcius to 78 degrees celcius in 2.00 minutes what must be the heat rating of the heater, in kJ/min
An unknown, rectangular substance measures 3.6 cm high, 4.21 cm long, and 1.17 cm wide. If the mass is 21.3g, what is this substance's density?
You have dissolved 0.298 g of soda ash into 80 mL of deionized water. It took 19.8 mL of 0.0998 M HCl to titrate the solution to the second equivalence point. What is the percent Na2CO3 in the soda
How many moles of CO2 are produces when 5.55 mol of ethane are burned in an excess of oxygen.
A 738 mL sample of nitrogen (N2) was collected by displacement of water at 24C under a total barometric pressure of 1270 torr.
A tank contains a mixture of 3.0 mol of nitrogen 2.0 mol of oxygen and 1 mol of carbon dioxide at 25 degrees and a total pressure of 10 atm calculate the partial pressure in torr of each gas?