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Ethanol is alcohol in alcoholic beverages. Many wines have ethanol contents of about 12% by volume. Although ethanol is not a natural nutrient, it is metabolized by the body and has a caloric value of 7 cal/gram. Density of ethanol 0.79 g/mL. How many calories would be derived from 4.0 oz glass of wine?
Write the mathematical equation to be used in determining the enthalpy change and explain each term in the equation.
Suppose you have just added 200.0 ml of a solution containing 0.5000 moles of acetic acid per liter to 100.0 ml of 0.5000 M NaOH. What is the final pH? The Ka of acetic acid is 1.77 x 10^-5
A balloon filled with 5.00 L of He is under 3.00 atm of pressure at 315 K. What will happen to the volume of the gas if the temperature drops to 255 K and the pressure changes to 1.50 atm.
A container with 644 mL of oxygen gas is at a pressure of 11.6 kPa. What pressure would be required to decrease the volume of the gas to 439 mL, assuming no temperature change?
an atom of a certain element has 20 electrons write the ground state configuration of the element
A sample of gas is collected over water at a temperature of 35.0?C when the barometric pressure reading is 625 torr. What is the partial pressure of the dry gas, given PH2O = 42.2 torr?
how many grams of sucrose, c12h22o11, must be dissolved in 750 ml of water to prepare a 0.250 molal solution?
An experiment shows that a 250mL gas sample has a mass of 0.434g at a pressure of 744mm Hg and a temperature of 27C. What is the molar mass of the gas?
In the standardization of potassium permanganate why is it unnecessary to add an indicator during the titration. Why is the solution of sodium oxalate acidified with sulfuric acid before titration
A buffer solution was prepared by adding 4.95 g of sodium acetate (NaCH3CO2) to 0.250 L of 0.150 M acetic acid (Ka = 1.75 x 10-5). What is the pH of the buffer
an experiment requires 40.0 of ethylene glycol a liquid whose density is 1.114 . rather than weigh the sample on a
The reactions represented below are all spoontaneous as written. For each, write the anode and cathode half - reactions and indicate the signs of the electrodes.
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