![]() I realised that many of my students in my GCE A-Level H2 Chemistry Tuition Classes are not well trained in their Junior Colleges when it comes to this basic concept. Do note that this is a very important concept when you are in JC1 and will still be tested when you are in JC2. Hope the above explanation is useful to you. Hence, the molecular formula of the hydrocarbon is CH 4. ![]() Essential for Life Carbon dioxide is necessary for life on Earth. Carbon dioxide was discovered in the 1600s by a Belgian chemist named Jan Baptist van Helmont. It is made up of one atom of carbon and two atoms of oxygen. Using the general equation and applying volume ratio, we have Introduction Carbon dioxide is a chemical compound that is usually in the form of a gas. Calculate the molecular formula of the hydrocarbon. Let’s check out an exam-based question to see how we can make use of the above to solve question.ġ0cm 3 of a gaseous hydrocarbon required 20 cm 3 of oxygen for complete combustion. Volume of water produced (as liquid) = 0 cm 3 Volume of carbon dioxide produced = x cm 3 ![]() Hence, if 1cm 3 of is completely burned in oxygen, Thus, the volume is negligible compared to volumes of C xH y (g), O 2 (g) and CO 2 (g). Hydrocarbons burns in excess oxygen based on the following equation:Ĭ xH y (g) + (x + y/4) O 2 (g) –> xCO 2 (g) + y/2 H 2O (l)Īt room temperature conditions or s.t.pm the water product is actually a liquid. This is a new concept for those that making their transition from GCE O-Levels to GCE A-Levels and thus will be one of the key questions to be asked in GCE A-Level H1 and H2 Chemistry Examinations. Today, we will discuss on the Determination of Molecular Formula of Hydrocarbons using Combustion Data. Earlier, we have discussed on the strategy of Determining the Molecular Formula of Compounds using Composition by Mass. ![]()
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