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Okay I got 9.8 for the perimeter, am I right? 

For the Area, would it be 1/2*4*9.8?

I'm not sure what that method is..?

Sorry for bothering again! Do I use the same formula for the second question? I tried to but I got 302.18 and that is not correct. Thank you!

Just leave it as ONE triangle....    area = 1/2 base x height   (easy)

Perimeter = L1 + L2 + L3    ONE leg is easy = 4    the other two are the same and you will have to calculate them using didstance between two points method.....

Keep working at it !  You'll get it ....

Thank you so much! I feel like the area was easier and yet I couldn't figure it out lol but i get it now

Oh okay!! My apologies. Now I understand! Thank you so much.

As did I     

AREA of rectangle  = H x W   = 3 x 4 = 12 sq units

Area of EACH triangle = 1/2 b * h      b = 4   h= 2      1/2 bh = 1/2 4 *2 = 4

     there are TWO triangles    total triangle area = 8

12 + 8 = 20 sq units total area

I responded

I solved the PV=nRT equation to find n = 7.132 moles of H2

      3 moles of H2  produce   2 Moles of ammonia (according to the equation)

7.132/3 * 2 = 4.875 moles

My problem is I don't know how to get the area... I literally got 5.8 lol

This is th same as asking   " how many times does  2 x 10^-7   go in to 4 x 10^-6 ? "

=20 times smaller

How did you get 7.312 moles? And the divide by 3 and multiply by 2? Sorry but I'm just confused about this. :(

First find A common denominator.....usually the LEAST COMMON DENOMINATOR is easiest to work with...

LCD of 4 and 6  ..... you could use 24   ....bu 12 will work too

Multiply through the equation by 12

(12)3/4 x + (12)2 = (12) 5/6

9x + 24 = 10 

See previous post......

Let's see...

Two short sides of the rectangle = 2 x 3 units = 6

   and FOUR triangle legs (they are all of equal length)....you can use pythag  theorom or distance formula for points

      using pyhtag      x^2+x^2 = 4^2

                               2x^2 =4^2

                                 x^2 = 2      x = sqrt 2

   FOUR of them = 4 sqrt 2 = 5.66 units               5.66 + 6 =11.66 units

      It appears YOU GOT IT!!!!

Now work on the area.....add the rectangle area + TWO triangle areas = ?

1

For every THREE moles of Hydrogen , TWO moles of ammonia are produced.

How many moles of Hydrogen are there?

PV=nRT  

  P ressure  V olume  n umber of moles   R=gas constant 0.082057 L atm mol-1K-1     T emp in K

12(15)= n (.082057)(300)        n = 7.312 moles

7.312/3  * 2 = 4.875 moles of ammonia produced

\(slope = \dfrac{y_2-y_1}{x_2-x_1} = \\ \dfrac{4-0}{x-(-3)} = \dfrac 1 2\\ \dfrac{4}{x+3}=\dfrac 1 2\\ 8 = x+3\\ x = 5\)