Question

1. the physical constants for ethanol are listed below. how much heat is absorbed when 250 g of ethanol is boiled at its boiling point?

physical constants for ethanol
specific heat capacity ethanol: 2.44 j/g°c
heat of fusion of ethanol: 109 j/g
heat of vaporization of ethanol: 838 j/g
a) 1.9 x 10⁴ j
b) 4.8 x 10⁴ j
c) 2.7 x 10⁴ j
d) 2.1 x 10⁵ j

Explanation:

Step1: Identify the formula

The heat absorbed \(q\) when a substance is boiled (phase change from liquid to gas) is given by \(q = m\times\Delta H_{vap}\), where \(m\) is the mass of the substance and \(\Delta H_{vap}\) is the heat of vaporization.

Step2: Substitute the values

Given \(m = 250\space g\) and \(\Delta H_{vap}=838\space J/g\).
Substitute into the formula: \(q=250\times838\).

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Answer:

d) \(2.1\times 10^{5}\space J\)