Please help me with my chemistry assignment???????

Posted on 2014-11-17 06:10:00 in Chemistry by RIKI

4) The following equation shows the conversion of aluminum oxide (from the ore bauxite) to aluminum:
2Al2O3(s)?4Al(s)+3O2(g), ?H = +801 kcal/mol

A) How many kilocalories are required to produce 1.96mol of aluminum?

B) How many kilocalories are required to produce 11.5g of aluminum?

5) How much heat is absorbed during production of 146g of NO by the combination of nitrogen and oxygen?
N2(g)+O2(g)?2NO(g), ?H = + 43 kcal/mol

6) How many Calories (that is, kilocalories) are in a 55.1g serving of potato chips if we assume that they are essentially 50% carbohydrate, and 50% fats? [Energy from Food, p. 189 in the textbook]

7) For the production of ammonia from its elements, 3H2(g)+N2(g)?2NH3(g),
?H = -22 kcal/mol.

A) How many kilocalories are involved in the production of 0.790mol of NH3?

8) For the evaporation of water, H2O(l)?H2O(g), at 100 ?C, ?H = +9.72 kcal/mol.

A) How many kilocalories are needed to vaporize 13.0g of H2O(l)?

B) How many kilocalories are released when 13.0g of H2O(g) is condensed?

9) During the combustion of 5.00 g of octane, C8H18, 239.5 kcal is released.

A) Write a balanced equation for the combustion reaction.

B) How much energy is released by the combustion of 1.64mol of C8H18 ?

C) How many moles of octane must be burned to release 418.6kcal ?

D) How many grams of octane must be burned to release 418.6kcal ?

E) How many kilocalories are released by the combustion of 18.4g of C8H18 ?

---

Answer Comment

No Answers Posted Yet.