MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryMole _ Equivalent ConceptMolecular Formula

Determine the empirical formula of Kelvar, used in making bullet proof vests, is 70.6% C, 4.2% H, 11.8% N and 13.4% O

A.C₇H₅NO₂

B.C₇H₅N₂O

C.C₇H₉NO

D.C₇H₅NO✓ Correct

Explanation

Elements % Mole ratio Simplest atomic ratio C 70.6 70.6 5.88 12 5.88 7 0.84 H 4.2 4.2 4.2 1 4.2 5 0.84 N 11.8 11.8 0.843 14 0.843 1 0.84 O 13.4 13.4 0.84 16 0.84 1 0.84 ∴ Empirical formula 7 5 C H NO The correct option is (d) Chemical Equations and Stoichiometry

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