Chemistry Help...Plz...HELP?

Propane, C3H8, is often used as a fuel for heating. It burns to produce carbon dioxide and water. Write a balanced equation for this combustion reaction. The heat of combustion for this reaction = 2044 kJ heat released per mole of propane burned. How many grams of oxygen would be required in the combustion of propane to produce 789 kJ of heat?

Answers=

A Swimming Pool, 33.1 meters long, 15.0 meters wide, and 4.36 meters deep, is filled with water. The temperature of the water is 26.3oC. The owner of the swimming pool would like the temperature of the water to be 36.0oC. How many grams of propane would have to be burned if all the heat from the combustion was used to heat the water to 36.0oC? The specific heat of water is 4.184 JK-1g-1.

Answer=

The balanced equation is
C3H8 + 5 O2 = 3 CO2 + 4 H2O
1 mole : 2044 = x : 789
x = 0.386 moles propane
moles O2 = 5 x 0.386=1.93
mass O2 = 1.93 mol x 32 g/mol=61.8 g

Volume = 33.1 x 15.0 x 4.36 =2164.7 m^3 = >2.16 x 10^9 cm^3
assuming density water = 1g/cm^3
mass water = 2.16 x 10^9 g

Q = 2.16 x 10^9 x 4.184 ( 36.0 - 26.3)=8.77 x 10^10 J => 8.77 x 10^7 kJ

1 : 2044 = x : 8.77 x 10^7
moles propane = 4.29 x 10^4
mass propane = 44 g/mol x 4.29 x 10^4 mol=1.89 x 10^6 g

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Pricing A Swimming Pool

Have you been daydreaming about the day when you can walk out your back door and cool off from the hot summer sun, in your very own swimming pool? If you're a new home owner or already have a castle of your own, you can install a pool now and get great savings. Due to a recent dip in the economy, prices on pools have gone down. Contractors are available to install a new pool in your yard, in most cases, immediately. Wondering how to price a pool before you select a contractor?

There are many things that you need to take to heart before you decide. Just like with anything else in the world that you may need or want to purchase, there are going to be rock bottom prices, extremely high prices and prices right in the middle. Typically, it's good to stay in the middle, somewhere. Sometimes, not all of the time, the lowest priced company may do the worst work. They may also do the best work. This is where doing a little research comes handy.

You need to figure out what type of pool you want installed. If you're going for a high end above ground pool, the prices are pretty standard. However, if you're going to have an in ground pool installed, you'll want to consider your options and find out what will work best for your home and your back yard.

You can get pools that are basic and very functional or you can get more ornate and have pool decks installed that match the face of your pool. You can incorporate the finish and look of your home and extend it to the look of your pool. These things all come in to play in the total cost of having a swimming pool put in.

Figure out what you can afford and find out who can give you the most for your money. Do you live in a warm climate? If you do, you'll be using the pool more than up North where pools are usually used for three months out of the year and need to be covered the rest of the year. You need to decide whether or not you need to buy a pool cover and add that in to the price.

You also need to decide if you're going to have a pool heater installed. If you think you'll be using the pool during the cooler months, you may want to spring for the initial cost. Most pools are now heated by propane which has proven to be cost effective.

If you're having a pool enclosure built, you should add this cost in to the price. Either way, you need to have a security fence put up to protect your kids and animals from the dangers of being alone near the water. All of these things add to how to price a swimming pool. fsdkdh67wwj

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