iv) A dry-cleaning solvent (Molar mass 146.99 g/mol) contains C, H and Cl only.

Question

iv) A dry-cleaning solvent (Molar mass 146.99 g/mol) contains C, H and Cl only. When a 0.250 g sample was studied by combustion analysis, 0 451 g of CO_2 g and 0.0617 g of H_2O formed. Find the empirical formula and molecular formula of the compound i) Write the balanced chemical equation for the following reactions and determine whether each of the reaction represents a combination reaction, a decomposition reaction or a combustion reaction a) Heating KNO_3 will produce K_2O, N_2 and O_2 b) Ni metal reacts with CO to produce Ni(CO)_4

Explanation / Answer

Q1

MW = 146.99 g/mol

m = 0.25 g of sample is combusted...

mol of sample = mass/MW = 0.25/146.99 = 0.00170 moles

then..

mol of CO2 = mass/MW = 0.451/44 = 0.01025

mol of H2O= mass/MW = 0.0617/18 = 0.003427

mol of C --> 0.01025

mol of H --> 0.003427*2= 0.006854

mass of Cl --> (0.250 - 0.01025*12 - 0.006854*1 ) = 0.120146 g

mol of Cl = mass/MW = 0.120146/35.5 = 0.0033843

ratios:

C:H 0.01025/0.006854 = 1.5

C:Cl = 0.01025/0.0033843 = 3

C3Cl and C2H3

C3H6Cl3 --> MW = 147 g/mol

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