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`        	A compound on analysis gave the following percentage composition C = 54.54%, H, 9.09%, O = 36.36 %. The vapour density of the compound was found to be 44. Find out the molecular formula of the compound. Can anyone give me questions like this`
4 years ago

```							for the first question1)A compound on analysis gave the following percentage composition: Na=14.31%, S = 9.97%,              H = 6.22%, O = 69.5%, calculate the molecular formula of the compound on the assumption that all the hydrogen in the compound is present in combination with oxygen as water of crystallisation. Molecular mass of the compound is 322 [Na = 23, S = 32, H = 1, 0 = 16].Solution :- Calculation of empirical formula 									Element									Percentage									Relative number of moles									Simple ratio moles									Simplest whole number ratio													Na									14.31									14.31			------- = 0.62			  23									0.62			------  = 2			0.31									2													S									9.97                      									19.97			-------- = 0.31			  32									0.31			------  = 1			0.31									1													H									6.22									6.22			------ = 6.22			  1									6.22			-----  = 20			0.31									20													O									69.5									  69.5			-------- = 4.34			   16									4.34			------ = 14			0.31									14						 The empirical formula is Na2SH20O14Calculation of Molecular formulaEmpirical formula mass = (23 x 2) + 32 + (20 x 1) + (16 x 14) = 322Molecular mass                                322n = ----------------------------------------   = ------------  = 1            Empirical formula mass                   322 Hence molecular formula = Na2SH20O14Since all hydrogens are present as H2O in the compound, it means 20 hydrogen atoms must have combined. It means 20 hydrogen atoms must have combined with 10 atoms of oxygen to form 10 molecules of water of crystallisation. The remaining (14 - 10 = 4) atoms of oxygen should be present with the rest of the compound.Hence, molecular formula = Na2SO4.10H2O.  	A compound on analysis gave the following percentage composition C = 54.54%, H, 9.09%, O = 36.36 %. The vapour density of the compound was found to be 44. Find out the molecular formula of the compound.SolutionCalculation of empirical formula									Element									Percentage									Relative number of moles									Simple ratio moles									Simplest whole number ratio													C									54.54									  54.54			------- -  =  4.53			    12									  4.53			--------  = 2 			  2.27									2													H									9.09									   9.09			--------    =  9.09			     1									  9.09			--------  = 4			  2.27									4													O									36.36									  36.36			----------  =  2.27			    16									  2.27			---------  =  1			  2.27									1						 Calculation of Molecular formulaEmpirical formula mass = 12 x 2 + 1 x 4 + 16 x 1 = 44Molecular mass =  2 x   Vapour density = 2 x 44 = 88             Molecular mass                       88n = ------------------------------------  = ---------   = 2        Empirical Formula mass              44 = C2H4O        x   2= C4H8O2
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4 years ago
```								An organic compound was found to have contained carbon = 40.65%, hydrogen = 8.55% and Nitrogen = 23.7%. Its vapour - density was found to be 29.5. What is the molecular formula of the compound?Ans:- C2H5NO	 A compound contains 32% carbon, 4% hydrogen and rest oxygen. Its vapour density is 75. Calculate the empirical and molecular formula.Ans:- C2H3O3, C4H6O6	 An acid of molecular mass 104 contains 34.6% carbon, 3.85% hydrogen and the rest is oxygen. Calculate the molecular formula of the acid.	 What is the simplest formula of the compound which has the following percentage composition: carbon 80%, Hydrogen 20%, If the molecular mass is 30, calculate its molecular formula.	A compound analyzes as 79.08% C,  5.54% H and 15.38%N. what is the molecular formula if the molar mass is 273.36g/mol?	Determine the molecular formula	A compound has an empirical formula of NO2 and a molar mass of 92g/mol	A compound has an empirical formula of C2H3O and a molar mass of 172g/mol	Ibuprofen, a common headache remedy, has an empirical formula of C7H9O and a molar mass of 215g/mol
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4 years ago
```							What is the simplest formula of the compound which has the following percentage composition: carbon 80%, Hydrogen 20%, If the molecular mass is 30, calculate its molecular formula.
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2 years ago
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