Step 3: Count the number of carbon atoms in the alkanone molecule. So one mole of O 2 weights : 2 x 16 = 32 grams 5 volumes of oxygen. Calculation: - Let the mass of the compound be 100 gm. The empirical formula of the given compound. Step 4: We can write the empirical formula by placing the numbers as the subscript to the elementâs symbols. If we start with: [math]CO^- + O_2 -> CO_2[/math] The balanced equation will be: [math]2CO^- + O_2 -> 2CO_2[/math] That means that there are two atoms of oxygen. â The mass of zinc = 52 gm â The mass of carbon = 9.6 gm â The mass of oxygen = 38.4 gm - No of moles of Zinc = 52/65 = 0.8 - No of moles of Carbon = 9.6/12 = 0.8 - No of moles of oxygen = 38.4/16 = 2.4 â Zn : C : O = 0.8 : 0.8 : 2.4 Step 2: Write a skeleton molecular formula using the symbols for carbon (C), hydrogen (H) and oxygen (O). The formula for carbon dioxide is CO 2, that means one atom of carbon and two atoms of oxygen. The oxygen:carbon ratio is 1.018, or approximately 1, and the hydrogen:carbon ratio is approximately 2. Thus, the mole ratio of carbon to oxygen and hydrogen to oxygen is 4 : 1 and 8 : 1. The gas oxygen that is in the "air" has the formula O 2. The atomic mass of carbon is 12 grams per mole. Step 4: Write the number of of carbon atoms into the skeleton molecular formula as a subscript number to the right of the symbol for carbon (C). Determine the formula of the compound. All volumes were measured in identical conditions. C H O . Oxygen is necessary in sustaining life and considered as a precious gem since it cannot be found in space. We can write an equation for this reaction: The plus sign indicates that carbon and oxygen react, and the arrow, usually read as âyields,â points to the result of their reaction: carbon â¦ Whatâs the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65.0% oxygen? One volume of a compound of carbon, hydrogen and oxygen was exploded with 2. Chemistry The Mole Concept Percent Composition 1 Answer The resultant mixture contained 2 volumes of water vapour and 2 volumes of carbon dioxide. Carbon dioxide is made of carbon and oxygen atoms. However, based on the studies, molecular oxygen â¦ The empirical formula of glucose is therefore CH 2 O, but what is its molecular formula? What is the chemical formula for each of the reactants? The ratio between carbon and oxygen is 1:2.The elements present in this compound are carbon and oxygen. A. C2 and O B. C2 and O2 C. C and O2 D. CO2 and O2 The chemical formula of it is CO2. For the reaction of carbon with a plentiful source of oxygen, as we have noted, the sole product is carbon dioxide. Oxygen has an atomic mass of 16 gram per mole. Carbon and oxygen bond to form carbon dioxide. Therefore, the empirical formula is C 4 H 8 O. 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