JEE Advanced 2024 Chemistry question on Aldehydes Ketones and Acids

In the following reaction sequence, the major product $\mathbf{P}$ is formed. [Reactant: a terminal alkyne $\mathrm{H{-}C{\equiv}C{-}}$ chain with a long $\mathrm{(CH_2)_{15}}$ spacer ending in a $\mathrm{CO_2Et}$ ester group] is treated with i) $\mathrm{Hg^{2+}}$, $\mathrm{H_3O^+}$; ii) $\mathrm{Zn{-}Hg/HCl}$; iii) $\mathrm{H_3O^+}$, $\Delta$ to give $\mathbf{P}$. Glycerol reacts completely with excess $\mathbf{P}$ in the presence of an acid catalyst to form $\mathbf{Q}$. Reaction of $\mathbf{Q}$ with excess NaOH followed by the treatment with $\mathrm{CaCl_2}$ yields Ca-soap $\mathbf{R}$, quantitatively. Starting with one mole of $\mathbf{Q}$, the amount of $\mathbf{R}$ produced in gram is ______. [Given, atomic weight: H = 1, C = 12, N = 14, O = 16, Na = 23, Cl = 35, Ca = 40]