8. The combustion of hexane produces carbon dioxide and water by the following:

Question

8. The combustion of hexane produces carbon dioxide and water by the following: 2Callu + 1902 12co, + 14H,o. A reaction of 4.5 moles of Oz will produce- moles of Hz a. 0.937 b. 3.316 c. 4.5 d. 6 9. Heating lead(l1) carbonate results in the following reaction: PbC03 PbO + COz. How many grams of lead oxide will be produced by the decomposition of 3.10 grams of leadI) carbonate? a. 2.59 b. 2.94 d. 3.27 5.2 moles of hydrogen is reacted with 9.0 moles of oxygen to produce water. Write a balanced reaction for the reaction between hydrogen and oxygen to produce water. 10. a. ans b, which reactant is limiting? an c. How many moles of the excess reactant remain?

Explanation / Answer

8.

From the balanced equation,

19 mol of O2 produces 14 mol of H2O

Then,

4.5 mol of O2 will produce 4.5 * 14 / 19 = 3.316 mol of H2O

(b)

9.

from the balanced equation,

1 mol (267.21 g. ) of PbCO3 forms 223.2 g. of PbO

Then,

3.10 g. of PbCO3 forms 3.10 * 223.2 / 267.21 = 2.59 g. of PbO

(a)

10.

(a)

2 H2 (g) + O2 (g) -----------------> 2 H2O (l)

(b)

from the balanced equation,

2 mol of H2 needs 1 mol of O2

Then,

5.2 mol of H2 needs 5.2 * 1 / 2 = 2.6 mol of O2

But, we have 9.0 mol of O2.

Hence O2 is excess reagent and H2 is limiting reagent.

(c)

Moles of reactant remained = 9.0 - 2.6 = 6.4 mol

Related Questions

Navigate

• Browse (All)
• Browse 8
• Subjects

---

---

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