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a weather ballon filled with helium has a volume of 1.0*10^-4L at 1.00 atm and 30.0C. it ascends to an altitude at which the pressure is only 0.60 atm and the temperature is -20.0C. what is the volume of the ballon at the higher altituda.
What is the pH resulting from mixing 50.0 mL of 0.0100 M H2CO3 with 1.50 mL of 0.100 M NaOH?
The decomposition of nitrogen dioxide is a second-order reaction. At 550 K, a 0.250 M sample decomposes at the rate of 1.17 mol/Lxmin a). Write the rate expression?
an acetic acid solution of 2.87 pH is titrated with 1.5 mL of bromocresol green. When the color changes to light green
calcutate the molecular weight of surfur if 35.5 grams of sulfur dissolve in 100 grams of CS2 to produce a solution that has a boiling point of 49.48c.
The combustion of one mole of propane, C3H8, releases 531 kcal. How much heat is released by the combustion of 1.20 moles of propane?
vinegar is a 5.0% solution by weight of acetic acid (CH3CO2H)in water. given that the ph for acetic acid is 2.41, the ka=1.8X10-5 and assuming the density of vinegar to be 1.00g/cm3, what is the percent dissociation for acetic acid in vinegar?
You need to prepare 100.0 mL of of buffer solution of pH=4.00 using 0.10M benzoic acid (pKa=4.20) and 0.160M sodium benzoate. What is the volume of each solution needed to prepare this buffer?
a.) Can you be certain that the organic layer would from the upper layer? Eplain in details. b.) How could you test to determine which is the non aqueous layer? Explain in details.
How many grams of water can be cooled from 34°C to 26°C by the evaporation of 81 g of water? (The heat of vaporization of water in this temperature range is 2.4 kJ/g. The specific heat of water is 4.18 J/g·K.)
WHY did lactose produce mnCO2 in an anaerobic fermentation experiment? (Hint: lactase mechanism, how do sugar transporters work,
What mass of sucrose should be combined with 483 of water to make a solution with an osmotic pressure of 8.50 at 320 ? (Assume the density of the solution to be equal to the density of the solvent.)
Why is the theoretical maximum final temperature reached by the water in a calorimeter always slightly higher than the highest recorded temperature
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