Which of following will always increase the internal energy of a system? The sys

Question

Which of following will always increase the internal energy of a system? The system gains energy and performs work. The system gains energy and work is performed on it. The system loses energy and performs work. The system loses energy and work is performed on it. None of the changes A-D will always increase the internal energy of a system At a certain elevation, the boiling point of water is 98.5 degree C. How much energy is needed to heat 35.0 mL of water from 23.4 degree C to the boiling point at this elevation? (C_p = 75.38 J/mol middot degree C), d = 1.00 g/mL] 8.50 kJ 11.0 kJ 198 kJ 1.00 kJ 25.6 kJ Given the following reactions, estimate the overall enthalpy change for dissolution of solid sodium hydroxide in water. NaOH (s) rightarrow NaOH (aq) Reaction delta H degree (kJ) Na(s) + 1/2 H_2(g) + 1/2 O_2(g) rightarrow NaOH(s) -427 Na(s) H_2O(l) rightarrow NaOH (aq) + 1/2 H_2(g) -184 2 H_2(g) + O_2 (g) rightarrow 2 H_2O(l) -572 -43 kJ -171 kJ -329 kJ

Explanation / Answer

Ans 35 . B)The system gains energy and work is performed on it

The change in internal energy of the system is given as ,

Delta U = q + w

So whenever the system gains egergy in the form of heat , and work is done on it , the internal energy of the system increases.

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