The temperature of a block of iron, which has a specific heat of 450 J/(kg K), increases by 3 K when 2700 J of energy are added to it. What is the mass of this block of iron?

Mass of iron block is 2 kg

Explanation:

We are given;

We are required to determine the mass of iron

To answer the question, we will consider the formula;

Heat energy = Mass × specific heat × Change in temperature

In this case;

Mass = Heat energy ÷ (specific heat × change in temperature)

Therefore;

Mass of Iron block = 2700 Joules ÷ (450 J/kg/K × 3 K)

                               = 2 kg

Therefore, the mass of iron block is 2 kg

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.