Question

he specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The heat capacity of a certain substance has been measured to be

Answer 1

Complete question is;

The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The specific heat capacity of a certain substance has been measured to be 3.52 J/g°C. Suppose 420.0 g of the substance is heated until the temperature of the sample has changed by 43.8 °C.

Write an equation that will let you calculate the last Q that was needed for this temperature change. Your equation should contain only symbols. Be sure to define each symbol.

Answer:

Q = m•c•Δt

Q = 64753.92 J

Explanation:

We are given;

Mass (m) = 420 g

Change in temperature; (Δt) = 43.8 °C

Specific heat capacity (c) = 3.52 J/g °C

The last Q is simply the heat energy that caused that temperature change.

This is given by the formula;

Q = m•c•Δt

Plugging in the relevant values;

Q = 420 × 3.52 × 43.8

Q = 64753.92 J