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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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I need to know how many gallons of water are in my pool

Formula For Average Gallons In Rectangle, Square Or Freeform Pools:
Length x Width x Average Depth x 7.5 = Total gallons
Formula For Average Gallons In Circular Pools:
Diameter x Diameter x Average Depth x 5.9 = Total gallons
Formula For Average Gallons In Oval Pools:
Length x Width x Average Depth x 5.9 = Total gallons
Formula For Average Depth Of Pools With Slopes:
Shallow End Depth + Deep End Depth Divided by 2 = Average Depth

Jun 18, 2017 | Pool & Spa

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How much area will be covered with 36.78 cubic feet of mulch please answer in feet and inches

How it Works

Stone and Mulch Calculators

As an example, let's use 500 square feet to be mulched at a
3" depth.
  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.

    So for our example: 0.25 foot depth times 500 square feet equals 125 cubic feet.
  3. If you are calculating 0.5, 2, or 3, cubic foot bags, simply divide 125 cubic feet by the size of the bag.

    So for our example: if we are using 2 cubic foot bags, we can divide 125 cubic feet by 2 which equals 62.5 bags.
  4. If you are calculating cubic yards, we need to convert 125 cubic feet to cubic yards by dividing by 27. One cubic yard is equal to 27 cubic feet, see the diagram below.

    So for our example: 125 cubic feet divided by 27 equals 4.63 cubic yards.

For Your Information

  • 1 inch equals 0.08333 feet
  • 1.5 inches equals 0.125 feet
  • 2 inc

Jun 29, 2016 | Office Equipment & Supplies

1 Answer

Calculate gallons of a tank

Hi there.
You can only get the area from the dimensions given (Depth x Width); if you have the length, multiply it with the area to get the volume in cubic inches then divide it by 231 to get the gallon equivalent.

Aug 28, 2014 | Kitchen Appliances - Others

1 Answer

York model number ( H2DB024806A ) FOR THE ABOVE MODEL NUMBER I NEED THE TONNAGE ,BTU,SENSIBLE & TOTAL CAPACITY. As soon as possible. Earliest reply will be highly appreciated. Thanks In...

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.

May 02, 2011 | Heating & Cooling

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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.

Recall that the rule for rounding off when adding or subtracting is to make sure that the final answer has the same precision as the values used to calculate it. Since each given value was good only only to the last unit

Nov 22, 2010 | MPS Multimedia QuickStudy Chemistry for PC

1 Answer

What is lattice enthalpy

The lattice enthalpy for a particular ionic compound is defined as DH for the process image636.gif. This cannot be measured directly as it is not possible to get this reaction to happen on its own, without many other reactions happening around it. Separate ions cannot be brought together in this way.

Aug 29, 2010 | LG Vu CU920 Cellular Phone

1 Answer

Steps to figure out formulas in excel

Hello this is Baris,
If you forget about the numbers and start naming your cells you can figure out your own formulas... Example :)

You buy apples, and you pay $2 per piece

in this case you have 2 numbers to find out how much you will pay.

price per apple

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.

Lets name your cells
Type in A1 Price
Type in B1 Quantity
Type in C1 Cost

Now, Column C is your calculation area.
Type in A2 2 (price for apples)
Type in B2 3 (quantity of apples)
Type in C2 =A2*C2 (price times quantity)

Now on, you don't have to calculate anything. You can change you price and quantity, cost will change by itself. Because the value in that cell is now related to other values in A2 and B2. I hope this gives you a starting point.

Sep 30, 2009 | Microsoft Excel for PC

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Matlab Solution for Work requirement and volumetric flow rate

please give me more description of the machine please

Sep 27, 2009 | Air Tools & Compressors

1 Answer

Height of tv

2000m = 2km, which is pretty high, and may cause problems at this altitude, probably something to do with pressure and the plasma gas ignition, I guarantee your fireplace is not this high.

May 04, 2009 | Samsung HPT5054 50 in. HD-Ready Plasma...

1 Answer

Scuba Gauges what do I need them for?

"A diver relies on scuba gauges to know three things: 1.-Depth 2.-Air Consumption 3.-Time Depth and Time are vital for nitrogen and air management. A scuba diver needs to know how deep he has been and for how long in order to judge the necessity and length of decompression stops and to calculate residual nitrogen for repetitive dives. The time of a dive is easily tracked using a scuba diving watch and the depth is tracked using a depth gauge. "

Dec 01, 2008 | Aeris Max Depth Analog 2 Gauge Console

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