# Example: The new empirical formula of your own material glucose (C

Example: The new empirical formula of your own material glucose (C
O = $$\frac < 1> < 50>$$ ? Mass = $$\frac < 1> < 50>$$ ? Molecule wt

Empirical formula The empirical formula of a compound may be defined as the formula which gives the simplest whole number ratio of atoms of the various elements present in the molecule of the compound. 6H12O6), is CH2O which shows that C, H, and O are present in the simplest ratio of 1 : 2 : 1. Rules for writing the empirical formula The empirical formula is determined by the following steps :

1. Split brand new part of for every single issues of the their atomic size. This gives new relative quantity of moles of several aspects present on the substance.
2. Separate brand new quotients received from the above step by the minuscule of these so as to get a simple proportion of moles of numerous aspects.
3. Multiply the fresh data, so received from the an appropriate integer, if necessary, so you can obtain whole matter ratio.
4. Finally take note of the latest symbols of the various facets side by the side and set the above mentioned number due to the fact subscripts for the straight down right hand part of every symbol. This may represent the new empirical algorithm of your own material.

Example: A substance, with the study, provided next constitution : Na = cuatro3.4%, C = eleven.3%, O = forty five.3%. Assess the empirical algorithm [Nuclear public = Na = 23, C = several, O = 16] Solution:

## O3

Determination molecular formula : Molecular formula = Empirical formula ? n n = $$\frac < Molecular\quad> < Empirical\quad>$$ Example 1: 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. Solution: Calculation of empirical formula :

? Empirical formula is CH3. Calculation of molecular formula : Empirical formula mass = 12 ? 1 + 1 ? 3 = 15 n = $$\frac < Molecular\quad> < Empirical\quad>=\frac < 30> < 15>$$ = 2 Molecular formula = Empirical formula ? 2 = CH3 ? 2 = C2H6.

Example 2: On heating a sample of CaC, volume of CO2 evolved at NTP is 112 cc. Calculate (i) Weight of CO2 produced (ii) Weight of CaC taken (iii) Weight of CaO remaining Solution: (i) Mole of CO2 produced $$\frac < 112> < 22400>=\frac < 1> < 200>$$ mole mass of CO2 = $$\frac < 1> < 200>\times 44$$ = 0.22 gm (ii) CaC > CaO + CO2(1/200 mole) mole of CaC = $$\frac < 1> < 200>$$ mole ? mass of CaC = $$\frac < 1> < 200>\times 100$$ = 0.5 gm (iii) mole of CaO produced = $$\frac < 1> < 200>$$ mole mass of CaO = $$\frac < 1> < 200>\times 56$$ = 0.28 gm * Interesting by we can apply Conversation of mass or wt. of CaO = wt. of CaC taken – wt. of CO2 produced = 0.5 – 0.22 = 0.28 gm

Example 3: If all iron present in 1.6 gm Fe2 is converted in form of FeSO4. (NH4)2SO4.6H2O after series of reaction. Calculate mass of product obtained. Solution: If all iron will be converted then no. of mole atoms of Fe in reactant product will be same. ? Mole of Fe2 = $$\frac < 1.6> < 160>=\frac < 1> < 100>$$ mole atoms of Fe = 2 ? $$\frac < 1> < 100>=\frac < 1> sugardaddydates.net/sugar-daddies-usa/tx/austin < 50>$$ mole of FeSO4. (NH4)2SO4.6H2O will be same as mole atoms of Fe because one atom of Fe is present in one molecule. ? Mole of FeSO4.(NH4)2.SO4.6H2 = $$\frac < 1> < 50>\times 342$$ = 7.84 gm.