4. Given that 4H--393.5 kJ for the rxn. given that AH=-2858 kJ for the rxn: give

Question

4. Given that 4H--393.5 kJ for the rxn. given that AH=-2858 kJ for the rxn: given that AH--84.7 kJ for the rxn: calculate the AH° for the rxn. C(s) +O2(g) ½O2(g) 3H2(g) + 2C(graphite) C2He(g) +3½02(g) CO2(g), and, H2O(), and C2H6(g) 2CO2(g) H2(g) + 3H2O(1) + KJ 5. When a 2.00 g sample of NaOH is dissolved in 98.0 g of water in a coffee-cup calorimeter, the temperature of the water rises from 21.2e to 26.5° C. Calculate the molar AH for the solution process of NaOH(s) Na"(aq) + OH(aq). Assume the specific heat of water and solutions of NaOH is 4.18 J/g-°C kJ/mole 6. What mass of water will provide the same amount of heat when cooled from 95.0°C to 35.0°C, as the heat provided when 100 g of steam is cooled from 111°C to 101°C? (see Table 5.1, p 232) SHOW YOUR WORK

Explanation / Answer

Ans 4 :

Lets number the reactions from 1 to 3 top to bottom.

Now multiply the reaction 1 by 2 and the reaction 2 by 3 , and then both the reactions together.

Subtract the reaction 3 from this reaction to get the desired reaction.

So the Delta H for the desired reaction = 2(-393.5) + 3(-285.8) + (+84.7)

= -1559.7 KJ

Related Questions

Navigate

• Browse (All)
• Browse 4
• Subjects

---

---

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