3.1 Read each of the following problems, and select a suitable basis for solving each one. Do not solve the problems. (a) You have 130 kg of gas of the following composition: 40% N₂, 30% CO₂, and 30% CH4 in a tank. What is the average molecular weight of the (b) You have 25 lb of a gas of the following composition: gas? CH₂ 80% C₂H 10% C₂H 10% What is the average molecular weight of the mixture? What is the weight (mass) frac- tion of each of the components in the mixture? (c) The proximate and ultimate analysis of a coal is given in the table. What is the composition of the "Volatile Combustible Matter (VCM)"? Present your answer in the form of the mass percent of each element in the VCM. Proximate Analysis (%) Ultimate Analysis (%) Moisture 3.2 Carbon 79.90 Volatile Combustible Hydrogen 4.85 matter (VCM) 21.0 Sulfur 0.69 Fixed Carbon 69.3 Nitrogen 1.30 Ash 6.5 Ash 6.50 Oxygen 6.76 Total 100.0 Total 100.00 (d) A fuel gas is reported to analyze, on a mole basis, 20% methane, 5% ethane, and the remainder CO₂. Calculate the analysis of the fuel gas on a mass percentage basis.
3.1 Read each of the following problems, and select a suitable basis for solving each one. Do not solve the problems. (a) You have 130 kg of gas of the following composition: 40% N₂, 30% CO₂, and 30% CH4 in a tank. What is the average molecular weight of the (b) You have 25 lb of a gas of the following composition: gas? CH₂ 80% C₂H 10% C₂H 10% What is the average molecular weight of the mixture? What is the weight (mass) frac- tion of each of the components in the mixture? (c) The proximate and ultimate analysis of a coal is given in the table. What is the composition of the "Volatile Combustible Matter (VCM)"? Present your answer in the form of the mass percent of each element in the VCM. Proximate Analysis (%) Ultimate Analysis (%) Moisture 3.2 Carbon 79.90 Volatile Combustible Hydrogen 4.85 matter (VCM) 21.0 Sulfur 0.69 Fixed Carbon 69.3 Nitrogen 1.30 Ash 6.5 Ash 6.50 Oxygen 6.76 Total 100.0 Total 100.00 (d) A fuel gas is reported to analyze, on a mole basis, 20% methane, 5% ethane, and the remainder CO₂. Calculate the analysis of the fuel gas on a mass percentage basis.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:*3.1 Read each of the following problems, and select a suitable basis for solving each one.
Do not solve the problems.
(a) You have 130 kg of gas of the following composition: 40% N₂, 30% CO₂, and
30% CH4 in a tank. What is the average molecular weight of the gas?
(b) You have 25 lb of a gas of the following composition:
CH₂ 80%
C₂H 10%
C₂H6 10%
What is the average molecular weight of the mixture? What is the weight (mass) frac-
tion of each of the components in the mixture?
(c) The proximate and ultimate analysis of a coal is given in the table. What is the
composition of the "Volatile Combustible Matter (VCM)"? Present your answer
in the form of the mass percent of each element in the VCM.
Proximate Analysis (%)
Ultimate Analysis (%)
Moisture
3.2
Carbon
79.90
Volatile Combustible
Hydrogen
4.85
matter (VCM)
21.0
Sulfur
0.69
Fixed Carbon
69.3
Nitrogen
1.30
Ash
6.5
Ash
6.50
Oxygen
6.76
Total
100.0
Total
100.00
(d) A fuel gas is reported to analyze, on a mole basis, 20% methane, 5% ethane, and
the remainder CO₂. Calculate the analysis of the fuel gas on a mass percentage
basis.
65(e) A gas mixture consists of three components: argon, B, and C. The following
analysis of this mixture is given:
40.0 mol % argon
18.75 mass % B
20.0 mol % C
The molecular weight of argon is 40 and the molecular weight of C is 50. Find:
(a) The molecular weight of B
(b) The average molecular weight of the mixture.
66/3.2 Two engineers are calculating the average molecular weight of a gas mixture contain-
ing oxygen and other gases. One of them uses the correct molecular weight of 32 for
oxygen and determines the average molecular weight as 39.2. The other uses an in-
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