1. In some fields the ideal gas law is expressed as PV = MRT. M is the mass of t
ID: 502676 • Letter: 1
Question
1.In some fields the ideal gas law is expressed as PV = MRT. M is the mass of the gas, and there is a different R for every possible gas. Why is there a different R for every gas? What advantage might there be in this case to using n (PV=nRT) rather than mass in this particular experiment? Consider the gases present and their ratios over time in your reaction.
Data
Hydrochloric
Acid
Acetic
Acid
Citric
Acid
Reaction Time (s)
35
1:04
1:32
Initial Reading (mL)
1
3
21
Final Reading (mL)
64
67
76
CO2 Volume (mL)
63
64
55
Yield (%)
78.75
80
68.75
Hydrochloric
Acid
Acetic
Acid
Citric
Acid
Reaction Time (s)
35
1:04
1:32
Initial Reading (mL)
1
3
21
Final Reading (mL)
64
67
76
CO2 Volume (mL)
63
64
55
Yield (%)
78.75
80
68.75
Explanation / Answer
Q1.
There is a different "R" since the R includes the total molar mass in order to avoid working with moles, i.e. for subjects such as mechanical engineering, in which engineers are not used to work with moles
so
PV = nRT
nR = Rgas
So
PV = Rgas*T
Q2.
the advantage of working with moles is that we can relate to chemical species, also plenty of formulas uses moles instead of mass, specially entropy equations
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