Molecule paraffin has the formula C20H44.

Come on, where's your school boy maths? Formula is Pi R Squared x Height. Therefore 3.142 x 2.5cm(radius) squared x 15cm = 294.56 cubic centimetres, call it 295.
Water weighs 1kilo at 1 litre so approx 295cc's will be 295 grams, if thats any help? If not substitute the true weight per mL or cc of paraffin because there are various grades of paraffin If you do it in old imperial, 1 english gallon of water is 10 lbs.

It means just one atom of an element is present in the molecule, or that just one group of several different atoms is present.
.

Hydrogen gas is a diatomic substance: Each molecule contains two hydrogen atoms.
A mole of hydrogen gas contains 6.02*10^23 hydrogen molecules, but since each molecule contains 2 hydrogen atom you have 2*6.02*10^23=?
The formula for nitric acid is HNO_3. It contains 5 atoms regardless of the elements
Now, 0.25 moles contain 0.25* 6.02*10^23 molecules oh nitric acid, ans since each molecule contains 5 atoms then 0.25 moles contain 0.25*5*6.02*10^23=? atoms
0.25*1*6.02*10^23 of hydrogen atoms, and the same number of nitrogen atoms and 0.25*3*6.02*10^23 oxygen atoms.

1 Look up the formula for the aluminum acetate.
2 Count the number of Hydrogen atoms per molecule: Call that nH.
3 Dividing 2.24*10^22 by nH you get the number of molecules of acetate.
4. Divide that number by Avogadro's Number to obtain the number of moles required.
5. Multiply the number of moles by the molecular mass of the aluminum acetate (look it up or use the periodic table to calculate it), you will get the mass of aluminum acetate that contains 2.24*10^22 hydrogen atoms.

How to fill your Dr. Scholl's Thermal Therapy Quick Heat Paraffin Bath1. Take the lid off your bath container and remove all packing materials.2. Place the unit on a flat, heat-resistant surface.3. Remove the plastic rack.4. Remove all three blocks of paraffin wax from the plastic wrapping. Each block is equal to one pound of paraffin wax, and three pounds of paraffin wax are needed to begin using your Paraffin Bath. Break each block in half, then in half again.5. Place the blocks of paraffin wax in the Paraffin Bath container.6. Plug the unit into an electrical outlet. The green light will glow. The red "Heater" light will initially come on and then cycle on and off while the wax is melting.7. Replace the lid and turn the switch to the "high" position. The paraffin wax will be ready for use when it is visibly melted (approximately 120 minutes).8. As soon as paraffin wax has melted, place the plastic rack on the bottom of the heating chamber. This will protect hands, elbows, and feet from heat.9. Turn the dial to the "Keep Warm" setting and wait 25 minutes before dipping hands, elbows, or feet.
Warning: DO NOT place hand or any other body part inside the chamber while the unit is melting the wax.
How to Dip Hands1. Remove jewelry, roll up sleeves, and thoroughly wash and dry hands. You can also rub in some of your favorite hand lotion.NOTE: The lid should be on during the time the unit is heating. Put the lid back on the unit after each use.2. Put a small amount of wax on the inside of your wrist to test the temperature.3. Spread fingers apart slightly and slowly immerse your hand in the paraffin wax container. Then immediately, but gently, remove your hand from the Paraffin Bath chamber. Let the paraffin wax solidify on your hand. Wait at least three seconds (until the paraffin wax no longer appears shiny) before redipping. Be careful to avoid touching the sides or the bottom of the Paraffin Bath chamber.4. Continue to dip your hand in and out of the paraffin wax, following Step 3, to build up layers of paraffin wax. For the best results, do this at least five times. The more layers, the longer the heat will last.5. If desired, cover your hands with glove liners and place your hands in the insulated mitts. These retain heat for better results.6. Remove the hand mitts from your hand. Remove the plastic glove and discard. Peel the hardened paraffin wax from your hands. It is recommended that the hardened paraffin wax be discarded.7. Massage in the oils left on your hand after the paraffin wax is peeled off to get the full invigorating and rejuvenating benefits of your Paraffin Bath.NOTE: Allow the paraffin to remain in place for 10-15 minutes before removing; longer if more layers exist or if the mitt has been used previously.
To Treat Feet or ElbowsFollow steps 1-4 as outlined for hands. Mitts are intended for use with hands only.
Product Care and Maintenance Place paraffin bath in a safe, cool and dry place when not in use. Wipe with a soft, damp cloth. DO NOT use abrasive cleaner. Never submerge the unit in any liquid. Keep away form all solvents and harsh detergents. DO NOT attempt to repair this paraffin bath. There are no user-serviceable parts.
STORAGEWhen not in use, "unplug it."Allow appliance to cool and store out of reach of children in a safe, dry location. To protect from dust or dirt, simply store in its original box. Never wrap the cord around the appliance since this will cause the cord to wear prematurely and break. Handle cord carefully for longer life and avoid jerking, twisting or straining, especially at plug connections.
CLEANING INSTRUCTIONSRemove plastic rack from heating chamber.1. DO NOT unplug the Paraffin Bath. Allow paraffin wax to remain undisturbed for a few minutes.2. Turn unit off and let the paraffin wax "harden."3. Right before cleaning, turn the unit on again until the paraffin wax is visibly melted around the entire edge (approximately 3-5 minutes), then turn unit off and unplug from the electrical outlet.4. Spread an ample amount of paper towels on a hard, flat, heat-resistant work surface and slowly turn the unit upside down to allow the hardened paraffin wax to drip from the chamber onto the paper towels. Allow the surface of the paraffin wax block to harden and then discard it. To clean the empty chamber, wipe with paper towels to remove any sediment.5. To clean the outside of the unit, remove any solidified paraffin wax.6. DO NOT use sharp objects to remove solidified paraffin max.7. DO NOT scratch or damage the Paraffin Bath chamber.8. DO NOT use abrasives when cleaning the Paraffin Bath chamber as it will damage the finish.9. If you discard the paraffin wax after each use, we recommend you clean out the unit completely every 40 uses. If you re-use the paraffin wax after every use, we recommend you clean out the unit completely every 20 uses.
PLEASE NOTE: This appliance should not be used in the presence of open cuts or wounds, inflammatory skin conditions, growth peripheral vascular disease where circulation is impaired, acute inflammation, or where sensation of the extremity is reduced or absent. If there is any question about peripheral vascular disease or decreased sensation of the extremities, consult a physician or physical therapist before using the Dr. Scholl's Thermal Therapy Quick Heat Paraffin Bath. Discontinue use if dermatitis due to paraffin sensitivity occurs. Discontinue use if wax feels too hot or cool, which could indicate health problems with the user.
There are also a bunch of standard warnings about dealing with electric appliances. Take care of them, don't dump them in water, etc., etc., etc.
It's worth pointing out that paraffin wax is flammable.

How to fill your Dr. Scholl's Thermal Therapy Quick Heat Paraffin Bath1. Take the lid off your bath container and remove all packing materials.2. Place the unit on a flat, heat-resistant surface.3. Remove the plastic rack.4. Remove all three blocks of paraffin wax from the plastic wrapping. Each block is equal to one pound of paraffin wax, and three pounds of paraffin wax are needed to begin using your Paraffin Bath. Break each block in half, then in half again.5. Place the blocks of paraffin wax in the Paraffin Bath container.6. Plug the unit into an electrical outlet. The green light will glow. The red "Heater" light will initially come on and then cycle on and off while the wax is melting.7. Replace the lid and turn the switch to the "high" position. The paraffin wax will be ready for use when it is visibly melted (approximately 120 minutes).8. As soon as paraffin wax has melted, place the plastic rack on the bottom of the heating chamber. This will protect hands, elbows, and feet from heat.9. Turn the dial to the "Keep Warm" setting and wait 25 minutes before dipping hands, elbows, or feet.
Warning: DO NOT place hand or any other body part inside the chamber while the unit is melting the wax.
How to Dip Hands1. Remove jewelry, roll up sleeves, and thoroughly wash and dry hands. You can also rub in some of your favorite hand lotion.NOTE: The lid should be on during the time the unit is heating. Put the lid back on the unit after each use.2. Put a small amount of wax on the inside of your wrist to test the temperature.3. Spread fingers apart slightly and slowly immerse your hand in the paraffin wax container. Then immediately, but gently, remove your hand from the Paraffin Bath chamber. Let the paraffin wax solidify on your hand. Wait at least three seconds (until the paraffin wax no longer appears shiny) before redipping. Be careful to avoid touching the sides or the bottom of the Paraffin Bath chamber.4. Continue to dip your hand in and out of the paraffin wax, following Step 3, to build up layers of paraffin wax. For the best results, do this at least five times. The more layers, the longer the heat will last.5. If desired, cover your hands with glove liners and place your hands in the insulated mitts. These retain heat for better results.6. Remove the hand mitts from your hand. Remove the plastic glove and discard. Peel the hardened paraffin wax from your hands. It is recommended that the hardened paraffin wax be discarded.7. Massage in the oils left on your hand after the paraffin wax is peeled off to get the full invigorating and rejuvenating benefits of your Paraffin Bath.NOTE: Allow the paraffin to remain in place for 10-15 minutes before removing; longer if more layers exist or if the mitt has been used previously.
To Treat Feet or ElbowsFollow steps 1-4 as outlined for hands. Mitts are intended for use with hands only.
Product Care and Maintenance Place paraffin bath in a safe, cool and dry place when not in use. Wipe with a soft, damp cloth. DO NOT use abrasive cleaner. Never submerge the unit in any liquid. Keep away form all solvents and harsh detergents. DO NOT attempt to repair this paraffin bath. There are no user-serviceable parts.
STORAGEWhen not in use, "unplug it."Allow appliance to cool and store out of reach of children in a safe, dry location. To protect from dust or dirt, simply store in its original box. Never wrap the cord around the appliance since this will cause the cord to wear prematurely and break. Handle cord carefully for longer life and avoid jerking, twisting or straining, especially at plug connections.
CLEANING INSTRUCTIONSRemove plastic rack from heating chamber.1. DO NOT unplug the Paraffin Bath. Allow paraffin wax to remain undisturbed for a few minutes.2. Turn unit off and let the paraffin wax "harden."3. Right before cleaning, turn the unit on again until the paraffin wax is visibly melted around the entire edge (approximately 3-5 minutes), then turn unit off and unplug from the electrical outlet.4. Spread an ample amount of paper towels on a hard, flat, heat-resistant work surface and slowly turn the unit upside down to allow the hardened paraffin wax to drip from the chamber onto the paper towels. Allow the surface of the paraffin wax block to harden and then discard it. To clean the empty chamber, wipe with paper towels to remove any sediment.5. To clean the outside of the unit, remove any solidified paraffin wax.6. DO NOT use sharp objects to remove solidified paraffin max.7. DO NOT scratch or damage the Paraffin Bath chamber.8. DO NOT use abrasives when cleaning the Paraffin Bath chamber as it will damage the finish.9. If you discard the paraffin wax after each use, we recommend you clean out the unit completely every 40 uses. If you re-use the paraffin wax after every use, we recommend you clean out the unit completely every 20 uses.
PLEASE NOTE: This appliance should not be used in the presence of open cuts or wounds, inflammatory skin conditions, growth peripheral vascular disease where circulation is impaired, acute inflammation, or where sensation of the extremity is reduced or absent. If there is any question about peripheral vascular disease or decreased sensation of the extremities, consult a physician or physical therapist before using the Dr. Scholl's Thermal Therapy Quick Heat Paraffin Bath. Discontinue use if dermatitis due to paraffin sensitivity occurs. Discontinue use if wax feels too hot or cool, which could indicate health problems with the user.
There are also a bunch of standard warnings about dealing with electric appliances. Take care of them, don't dump them in water, etc., etc., etc.
It's worth pointing out that paraffin wax is flammable.

Every associate leaves 4/5(n-1) molecules of a pile of n molecule. This result in an awful formula for the complete process (because every time one molecule must be taken away to make the pile divisible by 5):

4/5(4/5(4/5(4/5(4/5(4/5(p-1)-1)-1)-1)-1)-1), where p is the number of molecule in the original pile, must be a whole number.

The trick is to make the number of molecule in the pile divisible by 5, by adding 4 molecules. This is possible because you can take away those 4 molecules again after taking away one fifth part of the pile: normally, 4/5(n-1) molecules are left of a pile of n molecules; now 4/5(n+4) =4/5(n-1) +4 molecules are left of a pile of n+4 molecules. And because of this, the number of molecule in the pile stays divisible by 5 during the whole process. So we are now looking for a p for which the following holds:

4/5×4/5×4/5×4/5×4/5×4/5× (p+4) = (46/56) × (p+4), where p is the number of molecule in the original pile, must be a whole number.

Therefore, the smallest (p+4) for which the above holds, is 56.

So there were p=5 power 6 - 4 = 15621 molecule in the original pile.

I'd use 5 w 30 in cold or cool weather, then switch to 10 w 30 or, 10 w 40, when it gets hotter.

Your van is going to take about 4.5 quarts.( If I remember correctly ) But always check the dipstick.
Since your motor have some high miles on it, I would use non-synthetic 10w-30 oil that has the high mileage formula.
Synthetic will cause leaks on an old engine because the molecules are smaller and will go through gaskets easily.
High mileage formula will help recondition the gaskets.

Your truck is going to take about 5.5 quarts.
Since your motor have some high miles on it, I would use non-synthetic 10w-30 oil that has the high mileage formula.
Synthetic will cause leaks on an old engine because the molecules are smaller and will go through gaskets easily.
High mileage formula will help recondition the gaskets.