Molar mass of the unknown gas
A sample of an unknown gas effuses in 10.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.07 min. What is the molar mass of the unknown gas?
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1g of product is recrystallized from hexanes. The product has the formula C10H12O3. Calculate the percent yield. Answer to within 0.1 percent units.
A student mixed 5.00 mL of a nickel(2) chloride solution with 5.00 mL of .100M sodium phosphate and a precipitate formed. How many moles of sodium phospahte were present in 5.00 mL of the solution?
A compound contains 69.94 percent iron and 30.06 percent oxygen. What is its molecular formula if the molar mass of the compound is 199.55 grams per mole
The lethal inhalation does of sarin for a 200lb person has been determined to be 0.0015 mg. Determine the LD50 of sarin that researchers used to calculate this lethal inhalation does.
5000 joules of energy are added to 108 grams of silver, Ag, at 20°C. What is the final temperature of the metal? (the specific heat of silver is 0.235)
At 25?C the value of Kc for a particular reaction is 30. At 75?C the value of Kc for the same reaction is 40. Which one of the following statements about this reaction is necessarily true?
What mass of naphthalene must be dissolved in 24000 grams of benzene to give a solution with a freezing point 3.00 celsius below that of pure benzene?
A solution of ethanol in water is prepared by dissolving 75.0 mL of ethanol (density= 0.79g/cm^3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?
How much energy (in kilojoules) is needed to heat 4.00 of ice from -12.5 to 32.0? The heat of fusion of water is 6.01, and the molar heat capacity is 36.6 for ice and 75.3 for liquid water.
A solution contains 29 g of sucrose (C12H22O11), a nonelectrolyte, dissolved in 929 g of water. What is the boiling-point elevation?
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