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## Chemistry/ Theology/ Martial Arts -- Prof. Stephen

### Xenia, OH (45385)

 Travel Radius 20 miles Hourly Fee \$35.00 Discount \$29.75 - \$33.25 Save up to 15%
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# Stephen's Responses in WyzAnt Answers

#### How to find how many grams of nitrogen would fill 240 L

The problem says how many grams of nitrogen would fill a 240 L weather balloon to a pressure of 1.25 ATM at 29 degrees C

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Asked by Talaya from Fort Worth, TX
00

You want to use the Ideal gas Law for this problem since you have all the necessary information.

PV=nRT

Solve for n

PV/RT=n

plug in your information, remembering to use 0.08206 L·atm·mol−1·K−1 for R and to convert 29C to Kelvin.

Now you get how many moles of N you have.

12.09 moles N * 14.01g/mole N = 170 g. N

The key here is to see what information you have and to use the correct units. By always paying attention to the units, you can reduce most of your errors.

#### how to do scientific notation

how to write 1,030,000 in scientific notation

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Asked by Cheyenna from Cleveland, OH
00

Scientific Notation is done by reducing the number that you have to a number between 1 and 10. Then you have that number multiplied by the proper factor of 10 to get your original number.

For instance,

1,030,000 to be written in scientific notation, you have to make it a number between 1 and 10. So the original number becomes:

1.03 You keep your sig figs. Notice we had to move the decimal place 6 places to the left. So we multiply our number by 10 to the 6th power and it looks like this.

1.03 * 10^6

#### what's the easiest way to balance chemical equations?

i need help♥

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Asked by Jailene from New York, NY
00

Well, the answer is that there is no easy way to balance chemical equations. Some ways are easier than others but they all require some guesstimation. The best formula I've found to balance equations is to do the steps in the following order.

-Metals

-Non-metals

-Unchanged polyatomic ions (Nitrates, sulfates, etc.)

-then either Hydrogen or Oxygen depending on which one works better

After that, just go back through and double check. Sometimes you have to play with it a little bit. Let me give you an example to see if it helps clear things up and make them any easier.

Ca3P2 + H2O --> Ca (OH)2 + PH3

So balance the calcium first. There's three on the left side. So we'll add a 3 to the front of of Ca(OH)2. Remember you can only add numbers to the front of the substances, not the subscripts. So we get:

Ca3P2+ H2O --> 3Ca (OH)2 + PH3

Now, we balance the Phosphorus. There's 2 on the left, but only one on the right. It needs to be multiplied by 2. So we put the 2 in front of PH3.

Ca3P2 + H2O --> 3Ca (OH)2 + 2PH3

Now the Calcium (metal) and Phosphorus (non-metal) are both balanced. Let's work on the Hydrogen. We have 2 on the left, and 12 on the right. So we need to add a 6 in front of the H2O on the left. Doing that we get the following:

Ca3P2 + 6H2O --> 3Ca (OH) 2 + 2PH3

Now everything is balanced except the Oxygen. We have 6 on the left and coincidentally we have 6 on the right. It balanced itself by balancing the water.

If you work them this way, it will save you from most problems. Hope this helped.

#### how do I work out the problem x/-7 +9 = 6

I do not remember how to do the operations to solve these types of equations... x/-7 + 9 = 6 and the problem x/-4 + (-7) = (-16). what is the difference and how do you work them out?

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Asked by Melissa from Findlay, OH
00

First thing you do is take get everything on the opposite side of x. To do that, start by taking the parenthesis off first. Then take the (-7) and moving it over.

x/-4 + (-7) = (-16)

x/-4 - 7 = -16

x/-4 - 7 + 7 = -16 +7  Remember, whatever you do to one side, you have to do to the other.

x/-4 = -9  Now multiply both sides by -4

x= 36 Remember, the negatives cancel out

Now plug it back into the the original equation to see if it works.

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