C3H8 + 5O2 ---> 3CO2 + 4H2O

How many grams of carbon dioxide are produced from the reaction of 100.0g of propane? How many molecules of carbon dioxide are produced?

Cl2O7 + H2O ---> 2HClO4

How many grams of water are needed to react completely with 77.6 g of dichlorine heptaoxide? How many molecules of water are needed?

The molar solubility of PbCl2 in 0.20 M Pb(NO3)2 solution is:
(a) 1.7 x 10-4 M
(b) 9.2 x 10-3 M
(c) 1.7 x 10-5 M
(d) 4.6 x 10-3 M
(e) 8.5 x 10-5 M

Please show all work

Use tabulated half-cell potentials to calculate ?G?rxn for each of the following reactions at 25 ?C.

Part A 2Fe3+(aq)+3Sn(s)?2Fe(s)+3Sn2+(aq)

Part B O2(g)+2H2O(l)+2Cu(s)?4OH?(aq)+2Cu2+(aq)

Part C Br2(l)+2I?(aq)?2Br?(aq)+I2(s)

Will Magnesium spontaneously reduce Copper ion (Cu+2) to Copper (Cu)? Explain. What is the Edegree?

Mg(s) + Cu+2(aq)---> Cu(s) + Mg+2(aq)

Explain why vacuum pumps are used with rotary evaporators. What is the advantage of using a vacuum pump with a rotary evaporator?

1 A buffer is prepared by mixing 50.0 mL of 0.100 M acetic acid with 30.0 mL of 0.100 M sodium hydroxide and 20.0 mL of distilled water. Estimate the concentration of acetic acid in the resulting buffer. Report your answer in moles/liter, but do not include units with your answer. 2 Determine the concentration of acetate ions in the buffer solution. Report your answer in moles per liter, but do not include units in your answer. 3 Estimate the pH of the buffer solution using the Henderson-Hasselbalch equation. 4 Using the Henderson-Hasselbalch equation, estimate the pH of the buffer if an additional 10.0 mL of 0.100 M sodium hydroxide is added. 5 Estimate the pH of the original buffer if 10.0 mL of 0.100 M hydrochloric acid is added.

Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) is added to a 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to the original buffer system.

Hyrdrofluoric acid (Ka = 7.2 x 10^-4), is used in a wide range of commercial processes. HF is used for glass etching and the synthesis of pharmaceutical drugs and compounds such as teflon. One issue with HF is its corrosive nature, "Aqueous hydrofluoric acid is a contact-poison with the potential for deep, initially painless burns and ensuing tissue death." (from Wikepedia page on hydrofluoric acid).

The flouride ion is often used in dental procedures, as the F- can react with tooth enamel to form highly stable mineral fluorohydroxyapatite (which is less likely to break down in the mouth than "normal" enamel). One common form of F^- delivery is fluoride varnish, which has a F^- concentration of around 1.778 M.

Given what you know of the acid base chemistry of HF, what is the concentration of HF in an aqueous solution with a pH of 5.85?

What is the pH change when adding 0.15 moles of HCl to a 1 L buffer containing 1.0 M acetic acid and 1 M sodium acetate?

A`) decreased by 0.13 units

B) increse by 0.13 Units

C) increase by 0.15 units

D) decrese by 0.15 Units

E) no change

1.

Which of the following describes the element Cs.
Choose all that apply.

a.consists of diatomic molecules in elemental form

b.is found in nature only combined with other elements

c.reacts vigorously with alkali metals to form salts

d. is very reactive as a metal

e.forms a basic solution in water

f. is one of the group of the least reactive elements

2. Using only the periodic table arrange the following elements in order of increasing atomic radius:

boron, fluorine, oxygen, lithium

3. Using only the periodic table arrange the following elements in order of increasing atomic radius:

nitrogen, antimony, arsenic, bismuth

A 1.458-g sample of a solid, weak, monoprotic acid is used to make 100.0 mL of solution. 40.0 mL of this solution was titrated with 0.07942-M NaOH. The pH after the addition of 16.55 mL of base was 2.94, and the equivalence point was reached with the addition of 46.63 mL of base.

a) How many millimoles of acid are in the original solid sample? Hint: Don't forget the dilution.

b) What is the molar mass of the acid?

c) What is the pK_a of the acid?

Explain the rate-determining step, as discussed in General or Organic Chemistry

Draw orbital diagrams for atoms with the following electron configurations:

1. 1s²2s²2p⁶3s²3p⁶4s²3d⁷

12. Define the following terms and principles: (8 points)
    1. Heisenberg uncertainty principle
       
    2. Aufbau principle
       
    3. Pauli exclusion principle
       
    4. Hund’s rule

One method for producing hydrogen is to react coke (mostly solid carbon) with steam to make syngas, a mixture of CO and hydrogen

C(s) + H₂O(g) ⇌ CO(g) + H₂(g)     K_p = 0.45 at 900 K     ΔH = +131 kJ

What is the partial pressure of CO at equilibrium when 9.59 atm of H₂O(g) is heated with excess C(s) at 900 K?

After equilibrium is reached, CO(g) is added.

In which direction will the reaction shift?

Will the equilibrium constant, K, increase or decrease?