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A sample of helium effuses through a porous container 6.5 times faster than does unknown gas X?
what is the molar mass of the unknown gas?
ou have the following supplies: 2.00L of 1.00M KH2PO4 stock solution, 1.50L of 1.00M K2HPO4 stock solution, and a carboy of pure distilled H2O . How much 1.00M KH2PO4 will you need to make this solution?
How many moles contain each of the following? 3.75 x 10^24 molecules CO2
Consider the combustion of ethane 2C2H6 + 7O2 yields 4CO2 + 6H2O If the ethane is burning at the rate of 0.1 mol/L*s, at what rates are CO2 and H2O being produced?
A 97 gram solution of silver nitrate contains 10 grams of AgNO3. What is the percent by mass of silver nitrate in this solution. Answer in units of %
A 10mL sample of aquarium water was treated with reagents to form a colour, and after dilution to 100 mL was found to have an absorbance of 0.162. calculate the concentration in ppm of nitrite in the aquarium water.
A car travels at 58.0 miles per hour and gets 10.0 kilometers per liter of gasoline. How many gallons of gasoline are needed for a 1.00 hour trip.
What is the molality of ethanol in a solution prepared by dissolving 5.00 mL of ethanol (C2H5OH, of density 0.800 grams/mL) in 25.0 mL of water (H2O, of density 1.000 grams/mL)?
WHen 0.075 moles of ammonium sulfate ((NH4)2SO4) are dissolved in enough water to make 337 mL of solution, how many ammonium ions are present?
When 50.0 grams of metal at 75.0 °C is added to 100. grams of water at 15.0 °C, the temperature of the water rises to 18.3 °C. Assume that no heat is lost to the surroundings.
Calculate the pH of a buffer solution prepared by dissolving 0.200 moles of benzoic acid (C6H5COOH) and 0.450 moles of sodium benzoate (C6H5COONa in enough water to make 1.00 L of solution
Nickel nitrate and potassium carbonate react to form nickel carbonate and potassium nitrate. How many milliliters of 0.55M Ni(NO3)¬2 are needed to react with 85 mL of 0.25M K2CO3?
Calculate the energy levels of the pi-network in octatetaene, C8H10, using the particle in the box model. To calculate the box length, assume that the molecule is linear and use the values 135 and 154pm for C--C and C-C bonds.
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