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11.10.2019 •
Chemistry
Asample of water at 0 ºc has a mass of 10 grams. how much energy is absorbed when this sample melts?
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Ответ:
Example #1: A 36.0 g sample of water is initially at 10.0 °C. How much energy is required to turn it into steam at 200.0 °C? (This example starts with a temperature change, then a phase change followed by another temperature change.)
Solution:
q = (36.0 g) (90.0 °C) (4.184 J g¯1 °C¯1) = 13,556 J = 13.556 kJ q = (40.7 kJ/mol) (36.0 g / 18.0 g/mol) = 81.4 kJ q = (36.0 g) (100.0 °C) (2.02 J g¯1 °C¯1) = 7272 J = 7.272 kJ q = 102 kJ (rounded to the appropriate number of significant figures)Ответ:
1.) J
2.) C - arrows hitting each other
3.) A - W & X
4.) D, i think
Explanation: