Calculate the amount of heat (in joules) required to convert 92.5 g of water at

Question

Calculate the amount of heat (in joules) required to convert 92.5 g of water at 25. 0 degree C to steam at 108.0 degree C. (Sp. heat of H_2O(l) = 4.18 J/g middot degree C, Sp. heat of H_2O(g) = 2.03 J/g middot degree C, heat of vap. of H_2O(l) = 2.2W KJ g) 2.26 times 10^5 J 3.05 times 10^4 J 2.40 times 10^5 J 2.20 times 10^4 J 6.43 times 10^5 J Volatile liquids are described by all of the following except: Volatile liquids are easily vaporized. Volatile liquids have relatively high vapor pressures. Volatile liquids have strong cohesive forces. Volatile liquids have weak intermolecular forces. All of these describe volatile liquids. The boiling points of the halogens increase in the order F2

Explanation / Answer

6)
Q = Q (to covert water from 25 oC to 100 oC) + Q (convert water to steam) + Q (to convert steam from 100 oC to 108 oC)

Q = m*Cl*delta T + m*Cvap + m*cg*delta T
= 92.5*4.18*(100-25) J + 92.5*2.260 KJ + 92.5*2.03*(105-100) J
= 28998.75 J + 209.05 KJ + 938.875 J
= 29.0 KJ + 209.05 KJ + 0.94 KJ
= 239 KJ
= 2.39*10^5 J

Answer: c

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