Explanation in order to find the molecular formula we must first find the empirical formula we start by imagining a sample of the compound weighing 100 grams so the percentages can be seen as grams 25g of the sample is carbon 83g of the sample is hydrogen and 667g of the sample is oxygen. Empirical formula is just the ratio of the elements involved and written in condensed form whereas the molecular formula are the actual formula of compounds they may or maynot be condensed. The molecular formula tells you the number of atoms of each of the elements in one molecule of a compound in a previous video we found the empirical formula and this is a related idea but not . In a molecular formula it states the total number of atoms of each element in a molecule for example the molecular formula of glucose is c 6h 12o 6 and we do not simplify it into ch 2o and for each compound they all have a molecular formula but some can be similar and those are called isomers which are common in organic chemistry . The mole is used in chemistry to represent 6022 x 10 23 of that describes how to determine the number of moles of a compound in a known mass of the compound if we know its molecular formula compare 1 mole of h 2 1 mole of calculate the empirical or molecular formula mass and the molar mass of each of the following minerals
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