How many joules of heat must be added to melt a $75$ gram block iron if it required $12\mathrm{.}2$ Calories?

$0\mathrm{.}0509$ J

$2\mathrm{.}92J$

$342$ J

${2\mathrm{.}92}^{\text{'}}{10}^{3}J$

$5\mathrm{.}11{10}^{4}J$