At atmospheric pressure: a sample of gas at 38.2 degree C has a volume of 46.0 m

Question

At atmospheric pressure: a sample of gas at 38.2 degree C has a volume of 46.0 mL. Based on Charles' Law, what is the volume (in mL) of the same sample of gas at atmospheric pressure and 3.1 degree C? Enter your answer with three significant digits. Calculate the number of moles of oxygen gas in a 452.1 mL sample at a pressure of 632.2 torr and a temperature of 82.1 degree C. Enter your answer with 3 significant digits. A sample of hydrogen peroxide is catalytic decomposed by a catalyst and the resulting oxygen gas is collected in an Erlenmeyer flask using a water trap like the one described in Part B. The flask completely full of water has a mass of 352.2 grams. After gas collection, the flask and the remaining water have a mass of 302.1 grams. What is the mass (in grams) of the hydrogen peroxide sample if the temperature was 17.2 degree C? Enter your answer with 3 significant digits and do not enter the units (grams). Assume the density of water is 1.000 g mL and the barometric pressure is 650.0 torr. Don't forget that the vapor pressure of water will contribute to the overall pressure.

Explanation / Answer

Mass of oxygen collected is the mass of water lost =50.1

so the number of moles of oxygen= 50.1/18

And as per the reaction 2 moles of H2O2 produces one mole O2 , hence number of moles of H2O2= 50.1*2/18

mass of H2O2 = molecular mass*no of moles = 34*50.1*2/18=189.267

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