1. Using the standard enthalpies of formation, what is the standard enthalpy of reaction?

CO(g) + H₂O(g) --> CO₂(g) + H₂(g)

2. Calculate the standard enthalpy change for the following reaction at 25 �C.

HCl(g) + NaOH(s) --> NaCl(s) + H₂O(l)

3. For a particular isomer of C₈H₁₈, the following reaction produces 5113.3 kJ of heat per mole of C₈H₁₈(g) consumed, under standard conditions.

C₈H₁₈(g) + 25/2O₂(g) --> 8CO₂(g) + 9H₂O(g) (delta_rxn = -5113.3 kJ)

What is the standard enthalpy of formation of this isomer of C₈H₁₈(g)?

4. Many power plants produce energy by burning carbon-based fuels, which also produces carbon dioxide. Carbon dioxide is a greenhouse gas, so over-production can have negative effects on the environment. Use enthalpy of formation data to calculate the number of moles of CO₂(g) produced per megajoule of heat released from the combustion of each fuel under standard conditions (1 atm and 25 �C).

coal, C(s, graphite):

natural gas, CH₄(g):

propane, C₃H₈(g):

octane, C₈H₁₈(l) (?Hf� = �250.1 kJ �mol^-1):

*MUST SHOW WORK

1) What mass of hydrogen gas will be produced rom 4.76g of NO and 3.23 g of CH4?

2NO(g)+2CH4(g)-->2HCN(g)+2H2O(g)+H2(g)


2) A 250.0g sample of a metal with a specific heat 0.95 J/g-C is heated to 80.0 C and then placed in a calorimeter with water. The initial temperature of the water is 19.0C and the final temperature of the system is 25.1 C. The heat loss to the calorimeter is negligible. What is the mass of the water?

3) Determine the volume and density of 45.0 g of ethane, C2H6, at STP.

4) A sample of sulfur dioxide occupies 12.0L at 258C and 1.27 psi. What volume will it occupy at STP?

Copper(II) forms a 1:1 complex with the organic complexing agent R in acidic medium. The formation of the complex can be monitored by spectrophotometry at 480 nm. Use the following data collected under psuedo-first-order conditions to construct a calibration curve of rate versus concentration of R. Find the concentration of copper(II) in an unkown whose rate under the same conditions was 6.2x10^-3 A s-1. Also find the standard deviation of the concentration

The properties of alkenes and alkynes related to boiling, melting, polarity and solubility

A buffer composed of 0.50 mol acetic acid (HC₂H₃O₂) and 0.50 mol sodium acetate (Na⁺C₂H₃O₂^-) is diluted to a volume of 1.0 liter. The pH of the buffer is 4.74. How many moles of NaOH must be added to the buffer to raise its pH to 5.74?

4.) Consider the titration of 100.0 mL of 0.016 M HOCl (Ka=3.5×10−8) with 0.0400 M NaOH.

Part A

How many milliliters of 0.0400 M NaOH are required to reach the equivalence point?

Part B

Calculate the pH after the addition of 10.0 mL of 0.0400 M NaOH.

Part C

Calculate the pH halfway to the equivalence point .

Part D

Calculate the pH at the equivalence point.

The following table provides some information on carbon dioxide solubility in water.

Part A

What is the Henry's law constant for CO2 at 20∘C?

Express your answer in mol L−1 bar−1 to four decimal places.

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Part B

What pressure is required to achieve a CO2 concentration of 0.0980 mol L−1 at 20∘C?

Express your answer to three significant figures and include the appropriate units.

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Part C

At 1.01 bar, how many moles of CO2 are released by raising the temperature of 1 litre of water from 20∘C to 25∘C?

Express your answer to four decimal places and include the appropriate units.

there are 2 kinds of carbonyl acceptor structures in addition to benzoate esters that can be used in the reaction with phenylmagnesium bromide in order to produce triphenylmethanol. Also they react with a different number of equivalents of the Grignard Reagent. What are the carbonyl acceptors? please draw structure

If 155 mL of wet H2 is collected over water at 24 ∘C and a barometric pressure of 739 torr , how many grams of Zn have been consumed? (The vapor pressure of water is 22.38 torr.)

I have a couple questions the first one is:

1. Combine equations 1,2,3 to obtain equation 4. Then provide an equation for calculating the heat of reaction in kJ/mol.

Equation 1: MgO(s)+2HCl(aq)--->MgCl2(aq)+H2O(l)

Equation 2: Mg(s)+2HCl(aq)---->MgCl2(aq)+H2(g)

Equation 3: H2(g)+1/2O2(g)---->H2O(l)

2. Use Hess's Law to calculate the heat of reaction for the decompostion of methanol:

2CH3OH(l)--->2CH4(g)+O2(g)      Change Heat of reaction =?

Using this information:

H2O(g)--->H2(g)+1/2O2(g)            Change Heat= +241.82 kJ

CH4(g)+H2O(g)---->CO(g)+3H2(g) Change Heat = +206.10 kJ

2H2(g)+CO(g)---->CH3OH(l) Change Heat = -128.33 kJ

Maybe my assignment is poorly worded but I am confused as what to do, thank you for any help.

Be sure to answer all parts. Consider the reaction N2(g) + 3H2(g) → 2NH3(g)

ΔH o rxn = −92.6 kJ/mol

If 4.0 moles of N2 react with 12.0 moles of H2 to form NH3, calculate the work done (in joules) against a pressure of 1.0 atm at 25°C.

?w = (Enter your answer in scientific notation.)

What is ΔU for this reaction? Assume the reaction goes to completion. ΔU = kJ

Calculate the cell potential, at 25^oC, for the reaction

3 Zn(s) + 2 Cr⁺³(aq)[0.010 M] --> 3 Zn⁺²(aq)[0.020 M] + 2 Cr(s)

given,

Cr⁺³(aq) + 3e^- --> Cr(s) . . . . . . . E^o= -0.74 V

Zn⁺²(aq) + 2e^- --> Zn(s) . . . . . . E^o = -0.76 V

Question options:

Consider the hydroboration of 1-pentene. Predict the major outcome of this reaction through a transition state analysis and construct a reaction coordinate diagram to justify your answer. Note: the oxidation step after hydroboration does not have any impact on regioselectivity.

Each of the solvents listed below are used in experiments in this text to extract organic compounds from aqueous solutions.

(i)Methylene chloride

(ii)pentane

(iii)Toluene

(iv)Diethyl ether

Will the organic phase be the upper or lower layer when each of these solvents is mixed with water? Explain your an- swer for each case. (b) If you placed an ice cube in each of the solvents i–iv listed above in (a), would you expect an ice cube placed in each to float? Explain your answer for each case

You wash dishes for a chemistry laboratory to make extra money for laundry. You earn 12 dollars/hour, and each shift lasts 75 minutes. Your laundry requires 12 quarters/load.

Part A

How many shifts must you work if you wish to wash 10 loads of laundry?

Part B

How many loads of laundry can you wash if you work 3 shifts?

Part C

How many loads of laundry will each shift pay for if the cost per load rises to 16 quarters?