Question

How many calories are required to raise the temperature of a 35.0 g sample of iron from 25°C to 35°C? Iron has a specific heat of 0.108 cal/g °C.A. 38 calB. 1.1 calC. 3.8 calD. 93 cal

Answer 1

Answer:

$A$

Explanation:

Here, we want to get the number of calories Q of heat needed

Mathematically:

$\begin{gathered} Q\text{ = mc}\Delta T \\ \\ m\text{ = mass = 35 g} \\ c\text{ = specific heat capacity = 0.108 cal/g}\degree C \\ \Delta T\text{ = change in temperature = \lparen35-25\rparen}\degree C\text{ = 10 }\degree C \end{gathered}$

Substituting the values, we have it that:

$Q\text{ = 35 }\times0.108\text{ }\times10\text{ = 37.8 cal}$