The molar mass of hydrogen peroxide is 34.01 g/mol. of water vapor and oxygen gas, which equals the mass of the hydrogen peroxide present in the initial OxiClean sample. Mass percent composition is also known percent by weight. The concentration of H2O2, expressed as a weight-weight percent, can be determined by titration with a standard solution of potassium permanganate. This compound is also known as Hydrogen Peroxide. Calculate the moles of oxygen generated in each trial. Convert the air temperature from Activity 1 from Celsius to Kelvin. For water we have to calculate it % of Oxygen and % of Hydrogen. [At room temperature and pressure one mole of oxygen occupies 24000cm3.] Percent Composition Calculator. Thus, the percent composition of water, by mass, is #11.19%# hydrogen and #88.81%# oxygen… Percent Composition of Oxygen = 48.00/63.02. For a solution, mass percent equals the mass of an element in one mole of the compound divided by the molar mass of the compound, multiplied by 100%. Hydrogen peroxide (H2O2, 34.02 g/mol) is a chemical compound which is often used in hair bleach. 0 0. josh. (ii) How many moles of oxygen were produced at the end of the decomposition? 2. It is abbreviated as w/w%. How many moles of oxygen gas are formed from the decomposition of 3 moles of hydrogen peroxide… Molecular weight calculation: 1.00794*2 + 15.9994*2 ›› Percent composition by element hydrogen peroxide → oxygen + water 2H 2 O 2 (aq) → O 2 (g) + 2H 2 O(l) The volume of oxygen given off can be measured using a gas syringe, or by collecting in an inverted measuring cylinder. (iii) Use your answer to (ii)to calculate the concentration, in mol/dm3, of the 50.0cm3 of aqueous hydrogen peroxide used in the experiment. Nitric Acid Composition. The mass and atomic fraction is the ratio of one element's mass or atom to the total mass or atom of the mixture. Mass percent composition describes the relative quantities of elements in a chemical compound. (i) To calculate the mass of H2O2 in 1 litre of 2 M solution: Moleuclar mass of H2O2 = 2 x 1 + 2 x 16 = 34 amu Now 1 litre of 1 M solution contains H2O2 = 34 g(ii) To calculate the volume of O2 liberated at STP from 1000 cm3 of 2M solution: Decomposition of H2O2 can be represented as: Now 68 g of at S.T.P. Lv 4. Calculate the moles of hydrogen peroxide present in each trial. The percent composition is used to describe the percentage of each element in a compound. Answer link. Convert the change in volume from Activity1 to liters. 4 years ago. A chemist pipets a 10.00 mL aliquot of a liquid hair bleach, which has a density of 1.1081 grams mL-1, into a flask. 1 decade ago. 4. Source(s): https://shorte.im/a0nzM. Its long calculation to do it here but this video will help. 5. 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