CBSE Class 11-science Answered
(a) Butyric acid contains only C, H, O. A 4.24 mg of sample of butyric acid is completely burnt. It gives 8.45 mg of CO2 and 3.46 mg of water. What is the mass % of each element in butyric acid.
(b) The molecular mass of butyric acid was determined by experiment to be 88u. What is the molecular formula.
Asked by | 20 Apr, 2012, 05:49: PM
Expert Answer
Calculate The mass % age of different elements
% of carbon
CO2=C
44=12
8.45Of Co2 contain C= 12x8.45/44= 2.30 mg
% of C= 2.30x100/4.24=54.3%
% Of Hydrogen
H2O=@H
18=2
3.46 mg of H2O contain H=0.384 mg
% of H= 0.384x100/4.24=9%
% of O= 100- (54.3+9)= 36.7%
Now calculate the empirical formula of the compound
C 54.3 12 54.3/12=4.52 4.52/2.29=1.97 2
H 9.0 1 9/1=9 9/2.29=3.93 4
O 36.7 16 36.7/16=2.29 2.29/2.29=1 1
Empirical formula = C2H4O
Empirical formula mass = 2x12+4x1+16=24+4+16=44
Molecular mass =88
n= Molecular mass/ Empirical formula mass =88/44 =2
Molecular formula = nxEmpirical formula =2xC2H4O= C4H8O
Answered by | 24 Apr, 2012, 06:28: PM
Concept Videos
-
Basic Concepts of Chemistry
This video explains the concept of mole in terms of mass, volume, number an... -
Basic Concepts of Chemistry
This video explains the importance of chemistry in daily life, SI units of ... -
Basic Concepts of Chemistry
This video explains the concept percentage composition and empirical formul... -
Basic Concepts of Chemistry
This video explains classification and physical properties of matter. -
Basic Concepts of Chemistry
This video explains the law of conservation of mass, law of definite propor...
CBSE 11-science - Chemistry
Asked by hm6561889 | 15 Apr, 2024, 07:45: AM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by manikandanragul1 | 11 Apr, 2024, 09:02: AM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by jayag1298 | 08 Apr, 2024, 03:14: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by omniscientnjf2021 | 07 Apr, 2024, 10:18: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by ansh.skulkarni1158 | 07 Apr, 2024, 11:03: AM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by nikhithaguguloth14 | 29 Mar, 2024, 08:15: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by sumedhasingh238 | 27 Mar, 2024, 11:04: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by avijotsingh946431 | 22 Feb, 2024, 05:36: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by gurmelsinghray | 21 Feb, 2024, 08:43: AM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by VarunTYAGi9013 | 21 Oct, 2023, 07:14: PM
ANSWERED BY EXPERT
