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Given the initial and final states, it is not true that there can be only one reversible path. There are an infinite number of reversible paths, and they have different amounts of reversible work (and heat). But the difference between the reversible heat and the reversible work is the same for all the reversible paths.
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PE/PP bags are not formed by a single macromolecule.
Their macromolecules are linear with very occasional branching. The mass of each such a macromolecule is many orders of magnitude smaller than the mass of the bag.
So called giant macromolecules aka network covalent bonding have mass/size equal or at least comparable to the mass/size of the solid object. ...
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One likely possible meaning of USFDA is United States Food and Drug Administration, since
«The United States Food and Drug Administration (FDA or USFDA) is a federal agency of the Department of Health and Human Services. The FDA is responsible for protecting and promoting public health through the control and supervision of food safety, tobacco products, ...
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$\pu{25 mM}$ is not $\pu{0.025 mol}$ ( it would be $\pu{25 mmol}$), but $\pu{0.025 mol/L.}$ As $\mathrm{M}$ in this context means abbreviation for $\pu{mol/L}$ and $\pu{mM}$ for $\pu{mmol/L}$.
By multiplication with the molar mass, you get the mass concentration in $\pu{g/L}$.
$$\pu{\frac{25}{1000} molL-1} \cdot \pu{121.14 gmol-1} = \pu{3.0285 gL-1}$$
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Ideally, pressure affects just the reaction rate, not the rate constant, like for $\ce{A + B -> C}$:
$$\frac{\mathrm{d}C}{d\mathrm{t}} = k_1 \cdot p_\mathrm{A} \cdot p_\mathrm{B}$$
In case the are some non-linear effects and the reaction rate does follow the simple equation like above, with integer/half-integer exponents, there are possible several formal ...
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