# If the specific heat of water is 4.18J/g°C, how many joules of heat are given off when 5.0 g of water cool from 45°C to 25°C?

Nov 13, 2015

$418 J$
$W = m c \Delta T$
$= 5 g \times 4 , 18 J / g {.}^{\circ} C \times {20}^{\circ} C$
$= 418 J$