# The mass of water is 70.0 g. What is the energy required to heat a beaker of water at 18 degrees C to boiling?

Jul 27, 2016

The energy required is 24 kJ.

#### Explanation:

The energy required to heat an object is given by the formula

color(blue)(|bar(ul(color(white)(a/a) q = mcΔTcolor(white)(a/a)|)))" "

where

$q$ is the energy required
$m$ is the mass
$c$ is the specific heat capacity
ΔT is the change in temperature

$m = \text{70.0 g}$
$c = \text{4.179 J"·"°C"^"-1"·"g"^"-1}$
ΔT = "(100 - 18) °C" = "82 °C"
q = 70.0 color(red)(cancel(color(black)("g"))) × "4.179 J"·color(red)(cancel(color(black)("°C"^"-1"·"g"^"-1"))) × 82 color(red)(cancel(color(black)("°C"))) = "24 000 J" = "24 kJ"