A certain organic substance used as a solvent in many reactions contains carbon, hydrogen, oxygen and sulphur Weight % of hydrogen in the compound is 7.7. The weight ratio C:O:S= 3.2: 4. What is theleast possible molar mass of the compound ?(A) 86(B) 63(C) 94(D) 78

A certain organic substance used as a solvent in many reactions contai

1.	A certain organic substance used as a solvent in many reactions contains carbon, hydrogen, oxygen and sulphur Weight % of hydrogen in the compound is 7.7. The weight ratio C:O:S= 3.2: 4. What is theleast possible molar mass of the compound ?(A) 86(B) 63(C) 94(D) 78
Answer» The correct answer is option D.Explanation:Suppose in 100 gram of organic compound, 7.7 % is hydrogen.And Carbon , oxygen and SULFUR are ratio of 3:2:4.Mass of hydrogen in organic compound = Let the mass of carbon, oxygen and sulfur be 3x,2x and 4x respectively.7.7 G+3x+2x+4x=100 gx = 10.25 gMass of carbon = 3x = 3 × 10.25 g =30.75 gMoles of carbon =Mass of oxygen = 2x = 2 × 10.25 g =20.5 gMoles of oxygen =Mass of sulfur = 4x = 4 × 10.25 g =41 gMoles of sulfur =Moles of hydrogen =Least possible molecular formula will be equivalent to the empirical formula of this organic substance.Empirical formula of the compound can be determined by individually dividing the moles of all element with smallest number of moles.Carbon =Hydrogen =Oxygen =sulfur=The empirical formula or molecular formula the compound is :Molar mass of the molecular formula is:2 × 12 + 6 × 1+ 1 × 16 + 1 × 32 = 78 g/mol