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How efficient is the extraction of the tea leaves containing 1.0 g of caffeine with the two 3 mL portions of chloroform over that of a single-step reaction?
Calculate the value of deta S when 1.20 mol CH3OH (l) of is vaporized at 64.7 C. The normal boiling point of methanol is 64.7 C, and its molar enthalpy of vaporization is delta H = 71.8 KJ/mol.
By how much would the pH change, and in which direction, if we added to this solution enough base to neutralize 10% of the total acid?
A tank with a total pressure of 4.7 atm has a mixture of gases that is 72% nitrogen, and the rest is oxygen. What is the partial pressure of the nitrogen? The oxygen?
Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m. Assume the van't Hoff
Suppose you have 10 ml of 0.10m sucrose solution. you add 90 ml of water to the solution. Do the number of sucrose change? Does the molarity change?
Calculate the molarity of acetic acid in a viegar sample, knowing that 5.00 mL of vinegar requires 43.50 mL of 0.105 M NaOH to jut reach the phenolphthalein endpoint in a titration.
What is the specific heat of a metal if the temperature of a 12.5-g sample increases from 19.5 degrees C to 33.6 degrees C when it absorbs 37.7 J of heat?
A 93 gram solution of silver nitrate contains 16 grams of AgNO3. What is the percent by mass of silver nitrate in this solution?
One of the components of pineapple flavor is ethyl butyrate, which has the empirical formula (C3H6O)x. Its vapor took 162 seconds to effuse through a porous plug; the same amount of Co2 molecules e
A sample of propane,C3H8, contains 10.8 moles of carbon atoms. How many total moles of atoms does the sample contain?
"When strongly heated, magnesium sulfide formed a yellow crystalline deposit on the walls of a sealed reaction vessel. Metallic deposits were found on the bottom of the container" .
Lithium iodide has a lattice energy of -720kJ/mol and a heat of hydration of -793kJ/mol. Determine how much heat is evolved or absorbed when 10.0g of lithium iodide completely dissolves in water.
The normal respiratory rate for a human being is 15.0 breaths per minute. The average volume of air for each breath is 505 cm3 at 20 ? C and 9.95 × 10 4 Pa. What is the volume of air at STP th
What is the electron domain geometry and molecular geometry for iodine trichloride
A solution of ammonia and water contains 3.50×1025 water molecules and 5.80×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
The reaction of (Z)-butenedioic acid (fumaric acid) with butadiene sulfone gives only one product. Draw the product of this reaction and explain why only one product forms.
Determine the mass of milk of magnesia required to reduce the concentration of H+ ions to 0.010M. Assume the density of stomach acid is 1.0g/mL
If the initial concentration of ClO is 1.0 x 1011molecules/cm3, how long will it take for the oxygen atoms to decrease to 10.% of their initial concentration?
When nitrogen gas reacts with hydrogen gas, ammonia gas is formed. How many grams of hydrogen gas are required to react completely with 3.5 L of nitrogen at STP?
The concentration of a sodium hydroxide solution is determined by titrating it against a sample of potassium hydrogen phthalate (KHP). KHP is a weak acid with one hydrogen and a molar mass of 204.22 g
What maximum mass of sulfur, in kilograms, could be produced by the reaction of 1.3 × 104 m3 of SO2(g) with 2.5 × 104 m3 of H2S(g), both at STP?
Hydrochloric acid reacts with magnesium to produce hydrogen gas and magnesium chloride. Reacting magnesium with excess hydrochloric acid produces 1204 mL of hydrogen gas that is collected over water.
Calculate the work done when 65.0 g of tin dissolves in excess acid at 1.00 bar and 23°C. Assume ideal gas behavior. Sn(s) + 2 H+(aq) → Sn2+(aq) + H2(g).