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HOW TO BOIL WATER

-a chemical approach

You have been stranded in an abandoned ghost town that once housed a chemical factory. Having been there for three days, you have run out of supplies and desperately need drinking water. While wandering endlessly around, you notice a door open to the vacant factory. Inside you find a plethora of water containers. Knowing the water needs to be boiled first, you search the factory for a heat source. You hit the jackpot…a cabinet containing various hydrocarbons! But you must decide which will be the most efficient because you don’t know how long you are going to be stranded here and want to boil 100g of water at a time to ration the water. Ah, you recall freshman chemistry class and know that you need to calculate how much energy each hydrocarbon will give off when combusted. There is a problem however, you only have a limited supply of each hydrocarbon.

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Chemical Inventory ListChemical Inventory List METHANE, 0.5 g ETHANE, 0.75g PROPANE, 0.25g BUTANE, 0.25g METHANOL, 2g ETHANOL, 4g PROPANOL, 0.5g BUTANOL, 0.5 g

METHANE, 0.5 g ETHANE, 0.75g PROPANE, 0.25g BUTANE, 0.25g METHANOL, 2g ETHANOL, 4g PROPANOL, 0.5g BUTANOL, 0.5 g

Prolog Chemical List Library Solve

LibraryLibrary

You should see several options on the left that you may choose. These items should help you in solving the problem of boiling your water.

Molecular formulas

Combustion Reaction

Bond Energies

Equations

Specific Heat of Water

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Molecular FormulasMolecular Formulas

methaneethane

propanebutane

methanolethanol

propanolbutanol

Molecular formulas

Combustion Reaction

Bond Energies

Equations

Specific Heat of Water

Click on the compound to reveal its molecular formula.

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What is a Combustion Reaction?What is a Combustion Reaction?

To refresh your memory from general chemistry back in college, a combustion reaction is a chemical reaction that proceeds with evolution of heat and usually a flame; most combustions involves reaction with oxygen EX.

C6H14 CO2 + H2O + heat

It is important to remember that some heat will be lost to the environment when doing a combustion reaction; e.g. Not all of the heat can be harvested for use.

To refresh your memory from general chemistry back in college, a combustion reaction is a chemical reaction that proceeds with evolution of heat and usually a flame; most combustions involves reaction with oxygen EX.

C6H14 CO2 + H2O + heat

It is important to remember that some heat will be lost to the environment when doing a combustion reaction; e.g. Not all of the heat can be harvested for use.

O2

Molecular formulas

Combustion Reaction

Bond Energies

Equations

Specific Heat of Water

Prolog Chemical List Library Solve

Bond EnergiesBond Energies

The following table will calculate your bond energies for you. Click on the appropriate links to see your result.

The following table will calculate your bond energies for you. Click on the appropriate links to see your result.

Bonding elements

Bond Type Bond Energy (kJ/mol)

C,C SELECT NUMBER OF SPECIFIED

BONDS1,2,3,4,5,6,7,8,9,1

0

<ENERGY SUBTOTAL>

<TOTAL ENERGY FOR

HYDROCARBON>

C,0

C,H

Molecular formulas

Combustion Reaction

Bond Energies

Equations

Specific Heat of Water

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Specific Heat of WaterSpecific Heat of Water

The specific heat of water is definied as the amount of energy required to raise the temperature of one gram of water one degree Kelvin. Water’s specific heat is 4.18 J/g•K

The specific heat of water is definied as the amount of energy required to raise the temperature of one gram of water one degree Kelvin. Water’s specific heat is 4.18 J/g•K

Molecular formulas

Combustion Reaction

Bond Energies

Equations

Specific Heat of Water

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Possibly Useful EquationsPossibly Useful Equations

Reaction Enthalpy

Bond Enthalpy

Specific Heat

Reaction Enthalpy

Bond Enthalpy

Specific Heat

€

ΔHrxno = ΔHbonds formed − ΔHbondsbroken∑∑

€

ΔHbonds formed = BE products∑

Molecular formulas

Combustion Reaction

Bond Energies

Equations

Specific Heat of Water

€

Specific Heat =q

m • ΔT

€

where q ≡ amount of heat required(J or kJ)

m ≡ mass of sample (g)

ΔT ≡ change in temperature (K)

Prolog Chemical List Library Solve

SolveTime for some Re-hydration

SolveTime for some Re-hydration

From the following list, choose the most efficient compound and how many total grams of water you will be able to boil.

(solve button)

From the following list, choose the most efficient compound and how many total grams of water you will be able to boil.

(solve button)