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(4) while you were "sweating" your chemistry test, water vapor evaporates from your body, absorbing 125 kj of energy. (assume no temperature change). what mass of water evaporates?

Respuesta :

Edufirst
The heat absorbed by the water that evaporates from the body is the so called latent vaporization heat of water.

The standard latent vaporization heat of water is 2,264.705 kJ / kg.

So, you just have to divide 125 kJ / 2,264.705 kJ/kg = 0.0552 kg = 55.2 g

Answer: 55.2 g

Answer:

The mass of water evaporated is 55.31 g.

Explanation:

Latent heat of vaporization of water [tex]\Delta H_{vap}= 2260 J/g[/tex]

Mass of water evaporated = m

Change in temperature = ΔT = nil

Energy required to to evaporate the m mass of water present in sweat= Q

Q = 125 kJ = 125000 J

[tex]Q=\Delta H_{vap}\times m[/tex]

[tex]125000 J=2260 J/g\times m[/tex]

[tex]m=\frac{125000 J}{2260 J/g}=55.31 g[/tex]

The mass of water evaporated is 55.31 g.

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