Question about Office Equipment & Supplies

# How do I calculate the enthalpy when given quantity of air of 300kg/s in a depth of 2000m?

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Instead of multiplying the number of posts, try to give a description of the system you are trying to model: If the question comes from a book post it in full, including diagrams. That will increase its chances of being answered, but will not guarantee an answer.

Posted on Feb 15, 2014

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Posted on Jan 02, 2017

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### Stone and Mulch Calculators

As an example, let's use 500 square feet to be mulched at a
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1. First, the depth must be converted to feet. To convert inches to feet, simply divide inches by 12, the number of inches in a foot.

So for our example: 3 inches divided by 12 equals a 0.25 foot depth.
2. Now that we have the depth in feet, we can multiply the depth by the area.

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unit is 2 ton totla capacity 2 tons when mathced with proper equipment. BTU 24,000. Sensible heat only dervied from enthalpy chart once unit is installed. You will need a nate certified technician to assit you with the sensible and latent heat calculations for unit.

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### Estimate the bond energy' S-F' in SF6.the standard enthalpy of formation of SF6(gas),S(g),F(g) are-1100kj/mole,275kj/mole,80kj/mole respectively

What is the S-F bond energy in SF6 given DHfo for each of the reaction components?

For this problem you must first calculate the change in enthalpy (heat transfer, delta H under standard conditions) for the conversion, S(g) + 6F(g) => SF6(g) OR for the reverse reaction, it really doesn't matter, because the numerical value will be the same, regardless. Once you calculate the heat transferred, you will be able to say that the amount of heat transferred was the amount of potential energy trapped in all of the S-F bonds, all six of them in the molecule. So, to obtain the answer asked for (the energy content on one S-F bond), all you will have to do is divide by 6.

The above is a logical approach, because all six of the S-F bonds are identical. This is so, because, according to VSEPR theory (look it up for more background on that, if you are interested), you can predict that its molecular geometry is "octahedral" with the central sulfur atom having "sp3d2 hybridization."

Here is how you set up the problem:

First write the balanced chemical equation with the given heats of formation (in kJ) written under each of the reaction components:
S(g) + 6F(g) => SF6(g)
275 6(80.) -1100.

Note: I am assuming that each of the above quanties is good (i.e., known) to at least the unit's place; that is, + or - 1 kJ. This reasonable assumption allows me to unambiguously indicate the number of sig figs in each quantity - an important consideration for proper rounding off of the final answer.

Recall that the sum of the product values minus the sum of the reactant values, each component multiplied by its corresponding coefficient will give the net enthalpy ("reaction enthalpy") of the reaction as written. In this case, there being only one product, the reaction enthalpy is:
-1100 - (480 + 275) = - 1855 kJ. From this, we can see that as S and six Fs are combined, 1,855 kJ of heat are released into the surroundings (that is, an exothermic reaction). The amount of heat released informs you of the combined bond energy of ALL six S-F bonds.

A good rule to remember: As bonds are formed, energy is always released (an exothermic process). As bonds are broken (as in the reverse reaction), the same amount of energy is being absorbed (an endothermic process).

Therefore, in conclusion, one S-F bond has a bond energy of 309.17, which is more properly rounded off to 309 kJ.

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you have 3 apples you pay 6 dollars very simple right. 2 times 3.

Same thing in excel but this time you will just say price times quantity and excel will do the calculation for you.

Type in A1 Price
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Now, Column C is your calculation area.
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