Grade 12Physical Chemistry
116mg of a certain compound on vaporisation displaces 44.8ml of air. What is the molecular mass of the same?The correct answer (as per my book) is 58, which is easily obtained by considering that 116mg displaces 44.8ml and hence 22400ml being displaced by 58 gram. However, if I try to use the formula: Molar Mass = 2 x Vapor Density, I get 116 gram instead. Here's how: Vap. Density = (116mg/44.8ml)/(1g/22.4L) = 58. Hence Molec. Mass = 58 x 2 = 116. Where am I wrong?
116mg of a certain compound on vaporisation displaces 44.8ml of air. What is the molecular mass of the same?
The correct answer (as per my book) is 58, which is easily obtained by considering that 116mg displaces 44.8ml and hence 22400ml being displaced by 58 gram. However, if I try to use the formula: Molar Mass = 2 x Vapor Density, I get 116 gram instead. Here's how: Vap. Density = (116mg/44.8ml)/(1g/22.4L) = 58. Hence Molec. Mass = 58 x 2 = 116. Where am I wrong?
