A bag containing $0$ degC ice is much more effective in absorbing energy than one containing the same amount of $0$ degC liquid water.

a$.$ How much heat transfer is necessary to raise the temperature of mass $m$ of liquid water from $0$ degC to $30$ degC?

b$.$ How much heat transfer is required to first melt mass mbf $0$ degC ice and then raise its temperature?

c$.$ Explain how your answer supports the contention that the ice is more effective.

$m=0\mathrm{.}8kg$

# answer to $($b$)=$

$4\mathrm{.}320{10}^{5}J$

$7\mathrm{.}736{10}^{4}J$

$3\mathrm{.}693{10}^{5}J$

$1\mathrm{.}005{10}^{5}J$

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