(show all your works from part a to part c and please don\'t skip any questions
ID: 1012152 • Letter: #
Question
(show all your works from part a to part c and please don't skip any questions. Thanks you)
given the following properties of bromine: melting point: - 7.2 degree celsius, boiling point: 58.8 degree celsius, specific heat: 0.473 J/(g*degree celsius), heat of fusion: 5.29 kJ/mol, heat of vaporization: 15.4 kJ/mol
a. draw the heating curve for bromine
b. how much energy necessary to convert 150.0g of bromine at - 20.0 degree celsius to 150.0g of bromine at 80 degree celsius
c. what is the change in heat to convert 150.0g of bromine at 80 degree celsius to 150.0g of bromine at - 20.0 degree celsius
Explanation / Answer
q = m * s * dT + n * dH of fusion + m * s * dT + n * dH of vapourisition
q = 150 * 0.473 * (-7.2+20) + 150/160 * 5.29 * 10^3 + 150 * 0.473*(58.8 - (-7.2)) + 150/160*15.4*10^3 + 150 * 0.473 *(80 - 58.8)
q = 26.492 kJ
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