A gas obeys the equation of state P(V-b) = RT. For this gas, b= 0.0391 dm3 mol-1 . (a) Find the fugacity (f) and fugacity coefficient () for the gas at 1000 °C and 1000 atm using the residual volume method. (b) Find the residual chemical potential for this gas at 1000 °C and 1000 atm. Given: Chemica potentia, µi = ( G ni ) T, P, nj≠i µrea − µidea = RT(ln) R = 8.314 J/(mol-K) and dG = RT[d(lnf)] and dG = VdP, where G is the Gibbs free energy.

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answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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