Discussion
Assertion (A): Cubic equations of state are used throughout commercial process simulators.
Reason (R): They give acceptable accuracy for hydrocarbons over a wide range at very low computational cost.
Answer: D
Both are true and the reason gives the trade-off: a flash calculation may be repeated millions of times in a simulation, so an equation that solves in microseconds and is right to a few per cent beats a more exact but costly alternative.
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