. Percentage of carbon in ethylene(C H ) = mass of carbon Molar mass × % Percentage of carbon in propene (C H )= % . (a) relative atomic mass of C- is u . C II Key to brief answer questions: .
Given : The density of CO at K and atm pressure = . kgm – Molar mass of CO = ? At K and atm pressure, mole of CO occupies a volume of . L Mass of mole of CO = Kg m L g m m g Molar mass of CO = gmol – 11th Std Chemistry 11th Std Chemistry - - - - .
Compound Given no. of moles No. of oxygen atoms Ethanol - C H OH × . × Formic acid - HCOOH × .
× Water - H O × . × Answer : Formic acid . Average atomic mass = ( ) ( ) ( ) = = .31u . Reaction : x + y + z → xyz Question Number of moles of reactants allowed to react Number of moles of reactants consumed during reaction Limiting reagent x y z x y z (a) atoms atoms molecules atoms atoms molecules z (b) mol 1mol mol mol mol mol x and y (c) atom atom molecules atom atom molecules y (d) .
mol mol mol . mol . mol . mol x .
Given: mass of one atom = .