June 18, 2021, 11:52:30 PM
Forum Rules: Read This Before Posting

Topic: Combustion analysis  (Read 85 times)

0 Members and 1 Guest are viewing this topic.

Offline Win,odd Dhamnekar

  • Regular Member
  • ***
  • Posts: 94
  • Mole Snacks: +0/-5
  • Stock Exchange Trader, Investor,Chemistry Hobbyist
Combustion analysis
« on: June 10, 2021, 01:03:40 AM »
This question presents analytical data from which you are required to determine mass % composition for a compound of up to four elements.

A sample of a compound containing C,H,S and Br is subjected to combustion analysis to determine the quantities of C and H present. Using a second sample, the S is analyzed by converting it to BaSO4. The results of the analysis are shown below.

Sample 1 Mass:2.036 ⇒ CO2 Mass:3.703 ; H2O Mass:1.526

Sample 2 Mass:3.694 ⇒ BaSO4:3.236

My answer:

Mass of C=Mass of CO2*12/44
% C=1.010/2.036*100=49.61%

Mass of H=Mass of H2O*2/18
% H=0.1696/2.036*100=8.330%

The next element is determined similarly, using the second sample.
Mass of S=Mass of BaSO4*32.06/233.6
% S=0.4433/3.694*100=12.00%

The final element is obtained by difference.
« Last Edit: June 10, 2021, 01:26:39 AM by Win,odd Dhamnekar »
Any science consists of the following process.
 1) See 2) Hear 3) Smell if needed 4) Taste if needed
5) Think 6) Understand 7) Inference 8) take decision [Believe or disbelieve, useful or useless, healthy or unhealthy, cause or effect, favorable or unfavorable, practical or theoretical, practically possible or practically impossible, true or false or  any other required criteria]

Sponsored Links