7) Which of the following processes is endothermic? 7) A) the combustion of dies

Question

7) Which of the following processes is endothermic? 7) A) the combustion of diesel B) the chemical reaction in a "hot pack often used to treat sore muscles C) a hot cup of soup (system) cools on a countertop D) the freezing of water E) the vaporization of ethanol S) Calculate the fregpency of the green light emited by a hydrogen atom with a wavelength of 486.1 8) nm A) 4.33 1014-1 B) 162 1014 -1 C) 6.17 104- D) 146 1014-1 E) 6.86 x 1014-1 9) Calculate the amount of heat (in k) required to raise the temperature of a 79.0 g sample of ethanol 9) from 2980 K to 385.0 K. The specific heat caracity of ethanol is 2.42 T'g c A) 13.9 kJ B) 28.4k C)75.6 k D) 60.0 k E) 16.6 k 10) Using the following equation for the combustion of octane, calculate the heat associated with the 10) combustion of 100.0 114.33 g/mole. The molar mass of oxygen is 31.9988 g/mole g of octane assuming complete combustion. The molar mass of octane is 2csHs 2502-16 Co2 18 H20-11018k A)-4819 B)-385.5k C)-535.4kJ D)-11018 k3E)-6023 k

Explanation / Answer

Ans 7 : E) The vaporization of ethanol

When ethanol evaporates , it takes heat from the surroundings and converts from its liquid to gaseous form. In such a case the heat is absorbed by the process , so it is endothermic.

Related Questions

Navigate

• Browse (All)
• Browse 7
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.