245 g water sample initially at at 32 oC absorbs 17 kcal of heat. What is the final temperature of water?

Question

Chemistry

Jan Wells

9 March, 22:16

245 g water sample initially at at 32 oC absorbs 17 kcal of heat. What is the final temperature of water?

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Answers (1)

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Baron · Answer 1

Answer:62.66°C or 235.66K

Explanation:Q=McpT, the energy was given in calories so you first convert to Joules by multiplying the value in calories by 4.184J.

17*4.184=71.128kJ.

71.128kJ=mcpT

71.128kJ=245*4.187 * (T-Tm)

Tm is the final temperature of the mixture. The T is the temperature given which should be converted to Kelvin by adding 273 ... T=32+273=305K.

71128J=245*4.187 * (305-Tm)

71128=312873.575-1025.815Tm

1025.815Tm=312873.575-71128

1025.815Tm=241745.58

Tm=241745.58/1025.815

Tm=235.66K