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Answered 2013-09-28 05:23:35

Empirical formula: C3H2

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wt. of carbon= 12, and wt. of Hydrogen= 1 empirical formula wt. of CH3 = 12+1= 13 n= molecular wt./empirical formula wt. = 30/13 =2.3 rounded off to 2. therefore molecular formula is (CH3)n = (CH3)2 = C2H6... which is ethane..


Since carbon has an atomic mass of 12 and hydrogen has an atomic mass of 1, the mass of the empirical formula is 12 + 3 = 15. 60/15 = 4; therefore, the molecular formula is C4H12.


Because an empirical formula is the simplest form of a compound, we know that the molecular formula contains more atoms than it does. Since we are given the molar mass, we can use this formula. x ( MM of empirical formula ) = MM of molecular formula MM of empirical formula = 12(2) + 1(6) + 16 = 46 MM of molecular formula = 138 46x = 138 x= 138 / 46 x=3 Therefore, the molecular formula is 3(C2H6O) that is C6H18O3


From the formula C6H12O6, it is possible to tell that the compoundHas six carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms in every one of its moleculesHas a molar mass of 6(12.00g) + 12(1.01g) + 6 (16.00g) = 180.12 grams per mol.Has an empirical formula of CH2O (which is not to be confused with the molecular formula, for CH2O is the molecular as well as the empirical formula of formaldehyde, but it is clear from the larger quantities of carbon, hydrogen and oxygen atoms that C6H12O6 is not formaldehyde)Is probably a monosaccharide (simple sugar).What is not clear from this molecular formula is how the six carbon atoms, twelve hydrogen atoms, and six oxygen atoms are arranged. Different arrangements made from this same molecular formula result in different substances; for example, glucose and fructose share this molecular formula but are different sugars that are metabolized differently in the body.


Molecular formulas can not be determined from information about atomic ratios only. If the ratios stated are atomic ratios, then the empirical formula of the compound is CH2O. If the questioner meant, "A glucose molecule contains 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms ...", the molecular formula is C6H12O6.


First lets assume you mean percent by mass which are the usual numbers given. The determination of chemical formula from percentage by weight is achieved through the use of the concepts of molecular mass, empirical formula, and molar mass. The molecular mass of a compound can be found by taking its constitute atoms and adding their relative atomic mass (a number given in atomic mass units (u), where a carbon 12 isotope is defined as having a mass of 12). This will give a compound's molecular mass for example - carbon dioxide is composed of one carbon atom, and two oxygen atoms; the relative atomic masses being to three significant figures 12.0 and 16.0 respectively to three significant figures; by adding 12.0 to 16.0 x 2 you find 48.0 the mass of a carbon dioxide molecule. A compounds empirical formula is the chemical formula expressed in the simplest whole number ratio. For example take sucrose C12H22O11 the empirical formula of which being: C1H2O1. The molar mass of a compound is a mass in grams equal to the relative atomic mass, that is if you take our carbon dioxide molecule above with a molecular mass of 48.0 its molar mass is 48.0grams. Now, given a compounds percent composition and molecular mass you can find it's chemical formula. The first step in this process is finding the empirical formula. To find the empirical formula given percentages, as a convenience image you had a 100 gram sample. In this imagined sample you need to take the masses of each element you would have (it's the same as the percent weight) and divide this by the molar mass to find moles. Next having done this find the simplest whole number ratio between moles of each element. This will give you the empirical formula. Now having found the empirical formula we need to find the molecular mass of such a compound if it did exist. The molecular mass is found as above by multiplying each of the compound constitute parts by its relative atomic mass. With the empirical formula its molecular mass, and the molecular mass of the actually compound in hand we can calculate the chemical formula. Take the molecular mass for the compound and divide this by the molecular mass of the empirical formula. This will give you a positive integer, or close enough to. Take this number and multiply each of the subscripts for the empirical formula by it. You are done. For example - A you have determined through analytical analysis that the percent composition by mass of a compound is C-42%, H-6.4%, and O-51.6% you know the compound has a molecular mass of approximately 342u, what is the chemical formula? First our 100g sample -42 grams Carbon -6.4 grams Hydrogen -51.6 grams Oxygen m(Carbon)/M(Carbon) = 42/12 = 3.5 m(Hydrogen)/M(Hydrogen) = 6.4/1 = 6.4 m(Oxygen)/M(Oxygen) = 51.6/16 = 3.225 C:H:O ≈ 1:2:1 Therefore the empirical formula of our compound is C1H2O1 M(C1H2O1) = 12.0 + 2 * 1.0 + 16.0 = 30.0u M(compound)/M(C1H2O1) = 342 / 30.0 ≈ 11 Therefore our compound is: C1*11H2*11O1*11which gives C12H22O11


First find empirical formula by assuming you have 100 grams of the compound -85.6 grams of Carbon and 14.4 grams of Hydrogen Divide both these amounts by their mass per mole. Carbon: 85.6/12 = 7.13 Hydrogen: 14.4/1.008 = 14.28 Now divide the larger answer by the smaller answer. 14.28 divided by 7.13 to get a ratio of 2 H for every one Carbon in the empirical formula Empirical formula = CH2



the relative molecular mass or molecular weight of a compound is the mass of a molecule of the compound relative to the mass of a carbon atom taken as exactly 12.


The empirical formula is a bit like the lowest common multiple in math. Let us take C6H1206 which is glucose. By inspection it can be seen all the subscripts can be divided by 6 to yield CH2O and that is the empirical formula. If we took the hydrocarbon C6H12 which is cyclohexane, the empirical formula would be CH2 as the 6 and 12 subscripts can be divided by 6 to yield 1 and 2. etc.


the mass of 1.0 mole of the simplest ratio 'molecule' (CH) is (C) 12 + (H) 1 = 13 g for 1.0 mole (CH)78 g = 1 mole (CxHx) , so x = 78 / 13 = 6 so the molecular formula is C6H6


the molecular formula for sucrose is C12H22O11. in order for you to get the molecular weight of this compound you would take the molecular weight of carbon 12.0107 and multiply that by 12, the molecular weight of hydrogen 1.0079 times 22, and the molecular weight of oxygen 15.9994 times 11 and add them all together. should be 342.296 g/mol.


The molecular formula for cyclohexane is C6H12. Cyclohexane is a cycloalkane compound meaning it is a alkane compound whose carbon atoms are joined in rings. The structure of cyclohexane is a hexagon ring of bonded carbon atoms (six bonded carbons) encased by 12 hydrogen atoms (each carbon atom being bonded with two hydrogens).


Both formula mass and molecular mass refer to the mass of a compound relative to 1/12 of the mass of a Carbon-12 atom. However, molecular mass is specific to molecules – that is, only for a minimum of 2 atoms held together by covalent bonds. As an example, you can say that the molecular mass of water is 18. You can also say that the formula mass of water is 18. You can say that the formula mass of common table salt, NaCl, is 58.5, but it would be inaccurate to say that the molecular mass of NaCl is 58.5, since NaCl is not a molecule. The difference is not in numerical value but merely terminology.


It's very easy. First of all we test the given sample in laboratory to know about its constitution. Let's discuss it by taking an example:- Suppose the constitution of a compound is given as below:- C = 92.4%, H = 7.6% let's assume that the sample is 100 gram. so the weight of carbon is 92.4 gram & that of hydrogen is 7.6 gram. Now it's we must make sure that is the total of weights of constituents 100 or not? If it is not 100, it means there is an another element in the compound, and this is always oxygen in case of hydrocarbons. Step 1st :- Find out the number of moles of each element number of moles = weight of the element/atomic mass number of moles of C = 92.4/12 = 7.7 moles number of moles of H = 7.6/1 = 7.6 mole Step 2nd:- Find out the relative ratio of the moles:- It is simply done by dividing all by the smallest one C = 7.7/7.6 = 1.01 H = 7.6/7.6 = 1 Step 3rd:- If the ratio is not whole numbers the multiply all the numbers by a smallest integer number to make them whole numbers. Here in this case both are nearly whole numbers. so there is need to multiply these numbers. C = 1 H = 1 Step 4th:- Write the empirical formula C1H1 step 5th:- Find the weight of empirical formula 1*12 + 1*1 = 13 now if the molecular weight is given then the molecular formula can be written easily. molecular weight = ( empirical formula weight)n for example the molecular weight is 78. n = 78/13 = 6 so the molecular formula is = C6H6


Yes it does. Ex.: C6H12O6 is glucose, or sugar. To find the atomic mass, you must add up all the masses of each element like so: C=12.01 mol.g H= 1.01 mol.g O= 16.00 mol.g (12.01 x 6) + (1.01 x 12) + (16.00 x 6) = 180.18 mol.g is glucose's atomic mass. This can be done with any compound if you have the empirical formula, and the weights for the elements found on the periodic table.


One mole of this substance would mass at 86 grams because Carbon has a mass of 12 grams per mole and Hydrogen has a mass at 1 gram per mole. Therefore 12*6+1*14=86.


It would perhaps be more accurate to use the terms formula mass and molecular mass rather than formula weight and molecular weight. This because in physical terms, weight is a force while mass is a measure of the amount of substance in something. Both formula mass and molecular mass refer to the mass of a compound relative to 1/12 of the mass of a Carbon-12 atom. However, molecular mass is specific to molecules – that is, only for a minimum of 2 atoms held together by covalent bonds. As an example, you can say that the molecular mass of water is 18. You can also say that the formula mass of water is 18. You can say that the formula mass of common table salt, NaCl, is 58.5, but it would be inaccurate to say that the molecular mass of NaCl is 58.5, since NaCl is not a molecule. The difference is not in numerical value but merely terminology.


Carbon tetrachloride has one carbon atom and four chlorine atoms. Their atomic masses are 12 and 35.5 respectively. The molecular mass of the compound is 12+4x35.5= 154.


Element Element's atomic massC : 12H2 : 2(hydrogen's atomic mass is 1 but remember there are two)O : 16Add all the elements atomic mass and then divide the molecular mass by it. After that you only need to multiply all the subscripts of each element to find your answer.12+2+16=30240/30=88(CH2O) = C8H16O8


It has the molecular formula C20 H14 O4. Thus its Mr is (12*20+1*14+16*4) or 318.


Mg(magnesium atomic no. 12) and S(sulphur atomic no. 16) the formula of the compound will MgS(magnesium sulphide)


The empirical formula for sucrose is C(12) H(22) O(11). The molecule is known as a carbohydrate, and is a combination of 2 simpler sugars, glucose and fructose. The empirical formula for sucrose is C(12)H(22)O(11) It is known as a carbohydrate and is a combination of 2 simpler sugars, glucose and fructose.


There is no compound with the formula CHO. However, if you meant a sugar such as glucose, the formula is C6H12O6 . So, the total number of atoms is glucose is 6+12+6 = 24 atoms.


C6H12O6. 6 atoms of carbon, 12 atoms of hydrogen, 6 atoms of oxygen.



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