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A sample of gas is collected over water at a temperature of 35.0C when the barometric pressure reading is 763 torr. What is the partial pressure of the dry gas, given PH2O =42.2 torr?
Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C·g.
A 49g piece of ice at 0 degrees C is added to a sample of water at 9 degrees C. All of the ice melts and the temperature of the water decreases to 0 degrees C. How many grams of water were in the sa
A 493 mL sample of solution contains 33.2 g of CaCl2. Calculate the molar concentration of Cl in this solution
Methanol, a potential replacement for gasoline, can be made from H2 and CO by reactions CO + 2H2 - CH3OH. How will this reaction be affected if the volume of the container is replaced?
What is the value of work (w) when a piston of volume 0.2 L expands against an external pressure of 200 kPa to a volume of 3.4 L?
A soultion containing and unknown amount of tartaric acid with NaOH solution to titrate both acidid hydrogens. Write a balanced equation for the nuetralization reaction and calculate the molarity of
you have 3 L of gas at a certain temperature and pressure. What would the volume of the gas be if the temperature doubled and the pressure stayed the same?
How many moles of (NH4)2SO4 are there in 100.00 g of ammonium sulfate? How many moles of ammonium ions are in 100.00 g of ammonium sulfate? How many ammonium ions are in 100.00 grams of ammonium sul
An evacuated (empty) 276 mL glass bulb weighs 129.6375 g. Filled with an unknown gas, the bulb weighs 130.0318 g. Calculate the gas density in g/L, and express it with an appropriate number of sign
Assuming STP, how many liters of carbon dioxide are produce when 5.74 g of CaCO3 reacts with an excess of H3PO4.
Write the balanced net ionic equation for the reaction that occurs when 0.1 M solutions of copper(II) sulfate and calcium perchlorate are mixed.
The specific heat of an unknown metal is found to be 0.233 j kg. The law of dulong and petit predicts a molar heat capacity of J/K mol. Use this law to estimate the molar mass of the element.
The solid and toluene together weigh 58.88 g. The density of toluene at the temperature of the experiment is 0.864 {g/mL}. What is the density of the solid?
An element has three naturally occurring isotopes with the following masses and abundances (in parenthesis): 27.977 amu (0.9222); 28.974 amu (0.0469); 29.974 amu (0.0310).
What is the volume of 235 mL of a sample of gas at 53.0°C and 740. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.
A solution of ammonia and water contains 1.60×1025 water molecules and 7.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
A gas sample has an original volume of 700 ml when collected at 750 mm and 25°C. What will be the volume of the gas sample if the pressure increases to 810 mm and the temperature increases to 3
The ground water in Pherric, New Mexico contains 1.80 mg/L of iron as Fe+3. What pH is required to precipitate all but 0.30 mg/L of the iron as Fe(OH)3 at 25oC?
What is the volume of 340. mL of a sample of gas at 55.0°C and 740. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.
Calculate the molar concentration of a solution prepared by dissolving 5.4 g of sodium sulfate (MW = 142) in enough water to make 500 ml of solution ?
A gas made up of atoms escapes through a pinhole 0.552 times as fast as Ar gas. Write the chemical formula of the gas.
The final equilibrium temperature of the resulting solution is 60.8°C . What is the enthalpy of solution of LiCl expressed in kilojoules per mole ?