If 1.5 moles of hexane ( ) combust to completion: 6 14 C H

2.1 How many moles of CO2 would we have at the end of the reaction? [1]

2.2 How many moles of H2O would we have? [1]

2.3 How many moles of O2 would be consumed? [1]

2.4 What mass of oxygen would this correspond to? [2]

2.5 If after complete combustion, it is found that the combustion product contains 10% (mole) of oxygen. What was the mass fraction of oxygen in the mixture before combustion? [3]

NO OTHER DATA PROVIDED

4. A give soil has a CEC of 12.50 cmol of charge per kg of soil. If 70%, 15%, 10% and 5% of the CECis occupied by Ca+2, K+1, Mg and Na+1 , respectively, calculate the weight (grams) of Ca, K, Mg and Na in the soil.

5. A given soil contains the following colloids: 1.0% humus (CEC=200), 30% kaolinite (CEC=5), 5%smectite (montmorillonite) (CEC=80), 10% illite (CEC=20), 5% mica (CEC=70) and 49% sesquioxides (CEC=2). Calculate the CEC of the soil? Which colloids contributed the most and which contributed the least? (All CEC are in molc/kg soil).

6. Calculate the amount of pure CaCO3that could theoretically neutralize the H+ in one-year acid rain if a 1-hectare (ha) site received 200 mm of rain per year and the average pH of the rain was 5.0.

7. Calculate the pH and pOH of a soil with the following H+ concentrations: (a) 0.0000001M (b) 0.00001M (c) 0.005M? Which soil is relatively most acidic? Most basic?

8. Determine the calcium carbonate equivalent (CCE) of the following compounds: (amount that has the same neutralizing value as 100 g pure CaCO3) (a) KOH (b) Mg(OH)2 (c) and CaMg(CO3)2.

9. How many grams of limestone with a CaCO3 equivalent of 100% would you need to apply to an acidic soil with 85% exchangeable Al saturation to reduce it to 10%? The CEC of the soil is 12.5cmolc/kg.

10. How many grams of gypsum (CaSO4.2H2O) would you need to reclaim a sodic soil with an exchangeable sodium percentage (ESP) of 80% to reduce to it to 50%? The CEC of the soil is 12.5cmolc/kg.

Calculate E∘cell for each of the following balanced redox reactions. Are the reactions spontanous?

A) 2Cu(s)+Mn2+(aq)→2Cu+(aq)+Mn(s)

B) MnO2(s)+4H+(aq)+Zn(s)→Mn2+(aq)+2H2O(l)+Zn2+(aq)

C) Cl2(g)+2F−(aq)→F2(g)+2Cl−(aq)

What are some real-life applications of substitution reactions (SN1 & SN2) and elimination reactions (E1 & E2)? Please be specific and detail.

2CH₄ + 4Cl₂ = 2CHCL₃ + 2HCL

1) If 5.5 CH₄ react with 27.4 g CL₂ what is the limiting reactant and what mass of HCl will form? (I can find the LR but I have problems with finding the mass of HCL)

2) If for the above reaction, the theoretical yield of CH₃Cl is 7.2g and the actual yield of HCl is 3.2 g, what is the percent yield?

Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4. Some possibly useful molar masses are as follows: N2O4 = 92.02 g/mol, N2H4 = 32.05 g/mol.

            N2O4(l) + 2 N2H4(l) → 3 N2(g) + 4 H2O(g)

1. A fossil is found to have a 14C level of 87.0% compared to living organisms. How old is the fossil?

(answer in years)

2.Iodine-131 is a radioactive isotope. After 3.00 days, 77.2% of a sample of 131I remains. What is the half-life of 131I?

(answer in days)

1) Build models for the PH₃ and PH₄⁺ species.

How do you compare the angles of H - P - H bonds in both species? If different, explain why.

How do you compare your electronic and molecular geometries?

2 )Build the models for the PH₃ and H₂S species.

How do you compare the binding angles in both species? If they are different, explain why.

How do you compare your electronic and molecular geometries?

17.27 Briefly describe the two techniques that are used for galvanic protection.

In this experiment, benzyl and dibenzyl ketone will produce tetraphenylcyclopentadienone via aldol condensation reaction.

1.) What is a condensation reaction? What is the small molecule lost in this reaction?

2.) In this reaction, all the reactants are ketone compounds. Can condensation reactions be extended to other carbonyl compounds than ketones?

3.) What is an enol? In a tautomerization equilibrium, will the enol or the keto isomer will be favored?

4.) What is the driving force for the enolization? (what causes the enolate ion to be formed?)

5.) The reaction goes through color change. Why the color change happens in this reaction and how can this information is associated with the (predicted) success of this reaction?

6.) Side Products Possibilities:. Assume that and enolized molecule of dibenzyl ketone attacks another dibenzyl ketone. Write the overall chemical reaction.

1a. When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter.
In the laboratory a general chemistry student finds that when 1.33 g of CaBr₂(s) are dissolved in 103.70 g of water, the temperature of the solution increases from 24.23 to 25.85 °C.
Based on the student's observation, calculate the enthalpy of dissolution of CaBr₂(s) in kJ/mol.
Assume the specific heat of the solution is equal to the specific heat of water.
ΔH_dissolution =  kJ/mol

1b. In the laboratory a general chemistry student finds that when 21.18 g of Cs₂SO₄(s) are dissolved in 112.90 g of water, the temperature of the solution drops from 24.64 to 21.92 °C.
Based on the student's observation, calculate the enthalpy of dissolution of Cs₂SO₄(s) in kJ/mol.
Assume the specific heat of the solution is equal to the specific heat of water.
ΔH_dissolution =  kJ/mol

This is all the information the question gives me.

how do adhesion and cohesion explain capillary action?

how does water dissolve a substance like NaCl? Draw a picture illustrating this