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Explain changes in heat during changes of state, and describe latent heats of fusion and vaporization; Solve problems involving thermal energy changes when heating and cooling substances with phase changes
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After completing this activity you should be able to: identify when to use latent heat of fusion and latent heat of vaporisation. apply the equation for latent heat. substitute numerical values into algebraic equations using appropriate units. solve algebraic equations.
17 lip 2023 · To calculate the latent heat of vaporization using this method, follow these steps: Determine the initial and final temperatures of the substance. Measure the corresponding initial and final vapor pressures. Calculate the natural logarithm of the ratio of the vapor pressures.
Latent Heat. Latent heat due to the moisture in air can be calculated in SI-units as: h l = ρ h we q dw kg (2) . where . h l = latent heat (kW) . ρ = density of air (1.202 kg/m3) .
Worksheet. 12.2. Latent Heat, Specific Heat, and Work. 1. How much heat is absorbed by 100 g of ice at –10 ̊C to become water at 20 ̊C? 2. A 200–g sample of water at 80 ̊C is heated to steam at 120 ̊C. How much heat does it absorb? 3. How much heat is needed to change 2 kg of ice at -50 ̊C into steam at 150 ̊C? 4.
The heat \(Q\) required to change the phase of a sample of mass \(m\) is given by \[ Q = mL_f (melting/freezing),\] \[Q = mL_v (vaporization/condensation),\] where the latent heat of fusion, \(L_f\), and latent heat of vaporization, \(L_v\), are material constants that are determined experimentally.
The heat Q required to change the phase of a sample of mass m is given by \(\mathrm{Q=mL_f}\) (melting or freezing) and \(\mathrm{Q=mL_v}\) (evaporating or condensing), where \(\mathrm{L_f}\) and \(\mathrm{L_v}\) are the latent heat of fusion and the latent heat of vaporization, respectively.
