Name: _____________________________ period: ___________

Ch. 9 & 13 stoichiometry & gas test [70 points] Honors Chemistry

Show your work in an organized manner, includes any relevant equation / formula, proper units in your work / answer, and the proper number of significant figures in your answer.

Academic Honesty: The answers on this test are my own. I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam. If you do not sign or violate any of the preceding items, your semester grade is a F.

Signature: ___________________________

1. solve for the unknown pressure. [15 points]

	temperature	pressure	Volume
initial	25 °C	?	355 mL
final	325 K	150 kPa	0.45 L

2. A container at STP has 14.0 g CH₄, 40. g O₂, and 60. g N₂. What is the partial pressure of O₂ ? [10 points]

3. H₂O_{2 (aq)} --> H₂O _(l) + O_{2 (g)}

How many grams of H₂O₂ would decompose if there was 5.0 L O₂ at 23 °C and 750 torr formed in the above reaction ? [15 points]

4. How many grams of methanol (CH₃OH) and oxygen (O₂) would be needed to form 10.0 grams of water in a reaction involving the combustion of methanol and oxygen ? (15 points)

5. What is the % yield in the chemical reaction: 15.0 g N₂ + 5.0 g H₂  -->  12.0 g NH₃ ? (15 points)