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Required information

Problem $08\mathrm{.}037$E $-$ Mass and entropy of iron block.

An iron block of unknown mass at $185F$ is dropped into an insulated tank that contains $0\mathrm{.}8f{t}^3$ of water at $70F.$ At the same time, a paddle wheel driven by a $200\mathrm{.}0-$W motor is activated to stir the water. Thermal equilibrium is established after $10$ min with a final temperature of $75F.$ Use data from the tables.

Problem $08\mathrm{.}037$E$.$b $-$ Entropy generation during the process

Determine the entropy generated during this process. $($Round the final answer to three decimal places.$)$

The entropy generated during the process is $$ Btu$/$R$.$