Heat is released in the chemical reaction that causes iron to rust. Say you leave a nail in a cup of water and wait for it to entirely rust. The cup is not insulated, so the heat dissipates away .If the cup was placed on an extraordinarily sensitive scale, how much would the reading on the scale change if $1\mathrm{????}\mathrm{????}$ of energy was released as heat? $($The metric prefix Mega$-$ means $\times 10\mathrm{⁶}.)$