26.

A solution of 0.075 M CoBr2 is saturated with H2S ( [H2S] = 0.10 M). What is the minimum pH at which CoS ( Ksp = 5.9 x 10 -21) will precipitate?
Ka1 =8.9 x 10 -8 & Ka2 = 1.2 x 10 -13 for H2S and Ksp for CoS = 5.9 x 10 -21

1).State whether you agree or disagree with the following two statements, and explain why using thermodynamic arguments:

(a)Putting a lid on the pan of water when heating it up would enable the water to heat up more quickly(explain why using thermodynamics arguments)

(b)In mid-winter, when the temperature is less than 0 oC, ice forms from (liquid) water. This disproves the Second Law of Thermodynamics. (explain why using thermodynamics arguments)

In extracting the coconut oil which process will give a better results Cold process or Hot process?why?

What mass of carbon dioxide is produced from the complete combustion of 2.50×10−3 g of methane?

What mass of water is produced from the complete combustion of 2.50×10−3 g of methane?

What mass of oxygen is needed for the complete combustion of 2.50×10−3 g of methane? Express your answer with the appropriate units.

You are instructed to create 300. mL of a 0.34 M phosphate buffer with a pH of 7.3. NaH₂PO₄ is the acid component of the buffer. Na₂HPO₄ is the base component of your buffer.

What is the molarity needed for the acid component of the buffer?

What is the molarity needed for the base component of the buffer?

How many moles of acid are needed for the buffer?

How many moles of base are needed for the buffer?

How many grams of acid are needed for the buffer?

How many grams of base are needed for the buffer?

mathematically and conceptually, describe how enthalpy and entropy a re competing forces

If the heat of combustion for a specific compound is -1270.0 kJ/mol and its molar mass is 27.33 g/mol, how many grams of this compound must you burn to release 200.00 kJ of heat?

1. Which of the following processes have a Q value at equilibrium which increases as the temperature increases
a) mixing of H2SO4 and H2O
b) dissolving of O2(g) in H2O
c) 2Cl(g) -> Cl2
d) H2O(l) -> H2O(s)
e) dissolving of sugar in H2O

2. The instant you open a bottle of Diet Coke, which of the following describes the thermochemistry of bubble formation?
a) delta G > 0, Q > 0 b) delta G < 0, Q>0 c) delta G > 0. Q < 0 d) delta G < 0, Q < 0 e) need to know if K is >0 to answer

Thank you!

1. Write the balanced oxidation and reduction half reactions for the reaction of As2O3^(3-) and I2. What ion is oxidized and what ion is reduced?

2. Assuming that 5 mL of 0.006 M arsenite solution is subjected to coulometric titration as described in this laboratory using a current of 30 mamps. Calculate the time that the current should be applied to reach the endpoint of the titration.

Show each arrow pushing mechanisms between silver nitrate in ethanol with each of the following alkyl halides: 1-bromobutane, 2-bromobutane, 2-bromo-2-methylpropane, bromocyclohexane, bromobenzene, and α-bromotoluene

A sample of Hydrogen gas, H2, has a volume of 8.56 L at a temperature of 0oC and a pressure of 1.5atm. Calculate the number of moles of hydrogen gas in this sample.

Question 5Our next lab involves determining the partial pressure of an evolved gas in the process of a chemical reaction. If the atmospheric pressure is found to be 75.4 cm Hg, and the partial pressure of water is known to be (found in a reference table) 21 torr, what is the partial pressure of our evolved gas, in atm? 1.02 atm 0.992 atm 0.964 atm

pts On a very cold day, you notice that your tires look a bit deflated than warmer days. This observation can be explained by _____. Boyles Law Charles Law Ideal Gas Law

Question 81 pts Suppose your car is equipped with tire pressure monitoring system (TPMS) and the tire pressure is 34.0 psi on a 98 °F day in California. You decided to take a road trip to Alaska where the temperature drops to 20 °F. As you arrived in Alaska, you noticed that the tire pressure monitoring system alert light is illuminated. Why did this happen? a) as temperature decreases, gas molecules lose kinetic energy and the volume of gas is reduced thus reducing the overall pressure in the tire which results in the TPMS to become activated b) as temperature decreases, gas molecules gain kinetic energy and the volume of gas is reduced thus reducing the overall pressure in the tire which results in the TPMS to become activated c) as temperature decreases, gas molecules lose kinetic energy and the volume of gas increases thus reducing the overall pressure in the tire which results in the TPMS to become activated

Question 91 pts On a hot summer day, you notice that a bag of chips left in your vehicle has inflated. Why did this happen? (Outcome # 6) (DOK 3) a) as temperature increases, gas molecules gain kinetic energy and the volume of gas decreases inside the bag of chips b) as temperature increases, gas molecules lose kinetic energy and the volume of gas increases inside the bag of chips c) as temperature increases, gas molecules gain kinetic energy and the volume of gas increases inside the bag of chips

Question 101 pts Oxygen gas (PO2 = 1.10 atm), nitrogen gas (PN2 = 0.840 atm), and carbon dioxide gas (PCO2 = 0.125 atm) occupy the same container. What is the total pressure in the container? a) 2.07 atm b) 1.94 atm c) 0,135 atm

1. Write the balanced oxidation and reduction half reactions for the reaction of (As_2O_3)^3- and I_2. What ion is oxidized and what ion is reduced?

2. Assuming that 5 mL of 0.006M arsenite solution is subjected to coulometric titration using a current of 30 mamps. Calculate the time that the current should be applied to reach the endpoint of the titration.

Let’s consider the dissociation of phosphoric acid H3PO4. All four possible protonation states, with H number from zero to three, must co-exist in equilibrium.

H3PO4 <-> H2PO4- <-> HPO42- <-> PO43-

pK1=2 pK2=7 pK3=12

Find relative populations of all four states at the pH of the human blood, ~7.4.

What is meant with a ODE0D bleaching sequence?