1 decade ago. How many moles of oxygen gas are formed from the decomposition of 3 moles of hydrogen peroxide… Calculate the moles of oxygen generated in each trial. Nitric Acid Composition. 3. Percent Composition Calculator. 4 years ago. 0 0. josh. Molecular weight calculation: 1.00794*2 + 15.9994*2 ›› Percent composition by element Mass percent composition describes the relative quantities of elements in a chemical compound. 2. Problem: Hydrogen peroxide (H2O2) decomposes into water and oxygen gas. of water vapor and oxygen gas, which equals the mass of the hydrogen peroxide present in the initial OxiClean sample. 4. It is abbreviated as w/w%. Convert grams H2O2 to moles or moles H2O2 to grams. Convert the change in volume from Activity1 to liters. Mass percent composition is also known percent by weight. (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. The concentration of H2O2, expressed as a weight-weight percent, can be determined by titration with a standard solution of potassium permanganate. The molar mass of hydrogen peroxide is 34.01 g/mol. 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. Source(s): https://shorte.im/a0nzM. For water we have to calculate it % of Oxygen and % of Hydrogen. This compound is also known as Hydrogen Peroxide. Thus, the percent composition of water, by mass, is #11.19%# hydrogen and #88.81%# oxygen… (ii) How many moles of oxygen were produced at the end of the decomposition? given O2 = 22400 cm3 0 0. bushmaker. Hydrogen peroxide (H2O2, 34.02 g/mol) is a chemical compound which is often used in hair bleach. Convert the air temperature from Activity 1 from Celsius to Kelvin. 5. 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%. Calculate the moles of hydrogen peroxide present in each trial. Find the mass of each individual element and then divide by the total molecular weight. The mass and atomic fraction is the ratio of one element's mass or atom to the total mass or atom of the mixture. Lv 4. Percent Composition of Oxygen = 48.00/63.02. The percent composition is used to describe the percentage of each element in a compound. Its long calculation to do it here but this video will help. The percent composition can be found by dividing the mass of each component by total mass. 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