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MMLU-Pro / 12060 / A mixture of 6 mol of helium and 4 mol of nitrogen is at 170°F and 120psia. If…

Problem

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question

A mixture of 6 mol of helium and 4 mol of nitrogen is at 170°F and 120psia. If this mixture is expanded isentropic-ally to 25psia, find (a) the final temperature of the mixture, and (b) the entropy change for each constituent gas. Assume all gases are ideal.

category

engineering

options

  1. Final temperature of the mixture is 366.8°R, the entropy change for helium is 2.578 Btu/°R and for nitrogen is -2.578 Btu/°R
  2. Final temperature of the mixture is 500°R, the entropy change for helium is 2.578 Btu/°R and for nitrogen is -2.578 Btu/°R
  3. Final temperature of the mixture is 366.8°R, the entropy change for helium is 1.578 Btu/°R and for nitrogen is -1.578 Btu/°R
  4. Final temperature of the mixture is 366.8°R, the entropy change for helium is 2.578 Btu/°R and for nitrogen is 2.578 Btu/°R

src

stemez-Thermodynamics

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Source and history

upstream_id / Original problem ID
12060
task_id
4f02f435-e319-52c1-8f6f-b870248b20da
task_key
default--test--12060
task_revision_id
1
config / split
default / test

Official source

initial import