How much heat is required to raise the temperature of 150g of iron 20c to 25c?(specific heat of iron =480j/kg.c)

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Answer 1 · 2018-02-26T12:37:38

$300 J$ $300"J"$ of energy.

The formula for specific heat is:

$E = m c θ$ $E=mctheta$ , where:

$E$ $E$ is the energy needed in joules,

$m$ $m$ is the mass in kilograms,

$c$ $c$ is the specific heat,

$θ$ $theta$ is the change in temperature, Celsius of Kelvin doesn't matter.

Here,

$m = 0.125 kg$ $m=0.125"kg"$

$c = 480 {J/kg}^{\circ} C$ $c=480"J/kg"^@"C"$

$θ = 5^{\circ} C$ $theta=5^@"C"$ , and inputting:

$E = 0.125 \cdot 480 \cdot 5$ $E=0.125*480*5$

$E = 300 J$ $E=300"J"$ of energy is needed.