Short-Question

# How do you calculate the energy needed to heat something?

## How do you calculate the energy needed to heat something?

The specific heat capacity is the heat or energy required to change one unit mass of a substance of a constant volume by 1 °C. The formula is Cv = Q / (ΔT ⨉ m) .

How do you calculate the amount of heat energy needed to cause a rise in temperature?

To calculate the energy required to raise the temperature of any given substance, here’s what you require:

1. The mass of the material, m.
2. The temperature change that occurs, ΔT.
3. The specific heat capacity of the material, c (which you can look up).
4. Here is a source of values of c for different substances:
5. Q=m×c×ΔT.

How do you calculate the amount of heat absorbed?

The heat absorbed is calculated by using the specific heat of water and the equation ΔH=cp×m×ΔT. 4. Water is vaporized to steam at 100oC. The heat absorbed is calculated by multiplying the moles of water by the molar heat of vaporization.

### How to calculate the energy required to heat water?

Heat required (BTU) = m x C p x (Temperature Difference) Where C p is the heat capacity of water (1 BTU/lb/F) and m is the mass of the water (Assume 1 gal has 8.3 lb of water and the 3,412 BTU = 1 kWh) Solution: Energy required for heating the water to 120°F: = m × Cp × ΔT.

How is the specific heat of a substance calculated?

Every substance has a characteristic specific heat, which is reported in units of cal/g•°C or cal/g•K, depending on the units used to express Δ T. The specific heat of a substance is the amount of energy that must be transferred to or from 1 g of that substance to change its temperature by 1°.

How is the change in thermal energy calculated?

The change in thermal energy due to temperature changes is calculated using this equation: change in thermal energy = mass × specific heat capacity × change in temperature. This is when: change in thermal energy is measured in joules (J)

#### How to calculate the heat of vaporization of water?

Use the formula q = m·ΔH v in which q = heat energy, m = mass, and ΔH v = heat of vaporization. The amount of heat required to change 25 grams of water into steam is 56425 joules or 13500 calories. A related example illustrates how to calculate the energy when water changes from solid ice into steam . Helmenstine, Todd.