1. Exercise 11.79

A gas mixture contains 74% nitrogen and 26% oxygen.

If the total pressure is 1.18 atm what are the partial pressures of each component?

Express your answers using two significant figures. Enter your answers numerically separated by a comma.

2. Chapter 11 Question 11 - Algorithmic

What is the molecular weight of a gas if a 21.0 g sample has a pressure of 836 mm Hg at 25.0°C in a 2.00 L flask? (R= 0.0821 L atm/ mol K)

What is the molecular weight of a gas if a 21.0 g sample has a pressure of 836 mm Hg at 25.0°C in a 2.00 L flask? (R= 0.0821 L atm/ mol K)

3. Exercise 11.91

CH3OH can be synthesized by the reaction:
CO(g)+2H2(g)→CH3OH(g)

Part A

How many liters of H2 gas, measured at 748 mmHg and 83 ∘C, are required to synthesize 0.53 molof CH3OH?

Part B

How many liters of CO gas, measured under the same conditions, are required?

Express your answer using two significant figures.

4. Exercise 11.97

How many grams of calcium are consumed when 160.4 mL of oxygen gas, measured at STP, reacts with calcium according to the following reaction?
2Ca(s)+O2(g)→2CaO(s)

Calculate the percent ionization of hypobromous acid (HBrO) in solutions of each of the following concentrations (Ka = 2.5e-09.) (a) 0.263 M (b) 0.477 M (c) 0.868 M

prepare .1M Sodium phospahte buffer, pH 6.8. you need 500ml.

NaH2PO4-H20= 137.99g/mol

Na2HPO4-7H20= 268.08g/mol

Consider the following gas-phase reaction: C6H6(g) 3 C2H2(g) Using data from Appendix C of your textbook calculate the temperature, To, at which this reaction will be at equilibrium under standard conditions (Go = 0) and choose whether >Go will increase, decrease, or not change with increasing temperature from the pulldown menu.

T = ____K, and G will _______

For each of the temperatures listed below calculate G for the reaction above, and select from the pulldown menu whether the reaction under standard conditions will be spontaneous, nonspontaneous, or near equilibrium ("near equilibrium" means that T is within 5 K of To).

(a) At T = 896 K G=

(b) At T = 1792 K G=

(c) At T = 2688 K G=

Properties of matter

A metal crystallises in a face-centred cubic lattice.The edge of the unit cell is 286pm,and the density of the crystal is 7.92gcm^-3.Calculate the atomic mass of the element?

In the titration of 30.0 mL of a 0.200 M solution of a hypothetical compound NaH2M, what is the pH of the solution after the addition of 30.0 mL of 0.100 M NaOH? For H3M, pKa1 = 3.00, pKa2 = 6.00, and pKa3 = 9.00.?

The answer is 6.0 which is not what I got in my work. Please help me out !

Compare and contrast between the ionic addition and the free fadical addition of HBr to 1-butene.

1. mix 2.5 Ml cyclohexanone, 7.5g of KMnO4, 65 ml H2o in a round bottom flask. Use steam bath and heat to 30 degree C. 2. Add 1 ml of 3M NaOH solution, stirring with glass rod. When the temperature reach 45 degree C. slow the oxidation process by ice-cooling, and keep the temperature at 45 degree C for 30 mins. 3. Then heat the picture on heating mantle, adjust to 70V, wi reflux to complete the oxidation (55 degree C) 4. Make a spot test by withdrawing reaction mixture on the top pf the stirring rod and touching it to a filter paper. KMnO4 if present, will show purple ring around the spot. 5. Keep heating and make the spot test, unit there is no KMnO4 present. 6. Separate the solid and liquid mixture by suction filtration, rinse the brown precipitate well with water. 7. Add a boiling chip and evaporate the filtration to a volume of 17 ml. (while evaporating my cup tipped over and all of my product spilled, I only had about 3ml left.) 8. Acidify the hot solution with concentrated HCl to pH 1-2, add 5 ml acid in excess, and let the solution stand to crystallize. 9. Collect the crystals with suction filtration, rinse the solid with water. Turn on vacuum for few minutes to dry the solid completely. 10. measure the madd of the solid. and determine the melting point.

Calculate the theoretical yield of adipic acid.

What is the limiting reagent in this reaction? Why do you think this reagent rather than the other made limiting?

Why does acidification of the concentrated reaction mixture cause precipitation of adipic acid?

Why does the initially purple solution of KMnO4 change color as the oxidation progresses?

a thin circular-disk earning,5.00 cm in diameter is plated with a coating of gold 0.20 mm thick from an Au+3 bath.

a) how many days does it take to deposit the gold on one side of this earring if the current is 0.010 Ampere (d of Au = 19.3 g/cm3)

b) how many days does it take to deposit the gold on both sides of a pair of these earrings

c) if the price of Au is $320 per troy ounce 31.10 grams), what is the total cost of the gold plating?

where R=8.314 J/(mol⋅K), T is the Kelvin temperature, n is the number of moles of electrons transferred in the reaction, and F=96,485 C/mol e−.

At 68.0 ∘C , what is the maximum value of the reaction quotient, Q, needed to produce a non-negative E value for the reaction

SO42−(aq)+4H+(aq)+2Br−(aq)⇌Br2(aq)+SO2(g)+2H2O(l)

In other words, what is Q when E=0 at this temperature?

Express your answer numerically to two significant figures.

What are some of the key characteristics of unknown sample of an aqueous solution containing an ionic compound? Specific questions: 1. Given that the cation is from Group 1A, what is the identity of the group 1A metal ion in your solution? 2. Given that the ionic compound contains either chloride or hydroxide, how can you determine which? (Two pieces of evidence are required and one must be related to solubility rules) 3. What is the concentration of your solution? (Your unknown sample is known to be about 1 M, but you need to determine the concentration to 3 significant figures using titration. You should plan ahead so that you know approximately what volume of your sample you will need in order to use approximately 25 mL of 0.100 M sulfuric acid for the titration). I'm confused as to how I would go about figuring out these things when even actual information.

How does the Al:Si ratio affect the chemistry of the zeolite?

What are nitrogen isotherms, and what information does one obtain from them?

Explain the meaning of the three assumptions for the Michaelis-Menten kinetics. Express each assumption in mathematical terms.