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jeka57 [31]
3 years ago
7

Suppose an egyptian mummy is discovered in which the amount of​ carbon-14 present is only about oneone​-fifthfifth the amount fo

und in living human beings. the amount of​ carbon-14 present in animal bones after t years is given by yequals=y 0 e superscript negative 0.0001216 ty0e−0.0001216t​, where y 0y0 is the amount of​ carbon-14 present in living human beings. about how long ago did the egyptian​ die?
Chemistry
1 answer:
poizon [28]3 years ago
3 0

We are given the following equation:

y = y0 e^-0.0001216 t

where y = 1/5 y0, y0 is the original amount

So solving for time t:

1/5 y0= y0 e^-0.0001216 t

t = 13,235.51 years

 

So the human died about 13235.5 years ago

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H2(g) + Br2(l) ⇄ 2HBr(g) Kc = 4.8 × 108
elena-14-01-66 [18.8K]

Answer:

  • 1.5 × 10⁻⁹M

Explanation:

<u>1. Equilibrium equation</u>

  • H₂(g) + Br₂(l) ⇄ 2HBr(g)

<u>2. Equilibrium constant</u>

The liquid substances do not appear in the expression of the equilibrium constant.

    k_c=\dfrac{[HBr(g)]^2}{[H_2]}=4.8\times 10^8M

<u>3. ICE table.</u>

Write the initial, change, equilibrium table:

Molar concentrations:

         H₂(g) + Br₂(l) ⇄ 2HBr(g)

I          0.400                   0

C           - x                      +2x

E         0.400 - x              2x

<u>4. Substitute into the expression of the equilibrium constant</u>

     4.8\times 10^8=\dfrac{(2x)^2}{0.400-x}

<u>5. Solve the quadratic equation</u>

  • 192,000,000 - 480,000,000x = 4x²
  • x² + 120,000,000x - 48,000,000 = 0

Use the quadratic formula:

       

x=\dfrac{-120,000,00\pm\sqrt{(120,000,000)^2-4(1)(-48,000,000}}{2(1)}

The only valid solution is x = 0.39999999851M

Thus, the final concentration of H₂(g) is 0.400 - 0.39999999851 ≈ 0.00000000149 ≈ 1.5 × 10⁻⁹M

8 0
3 years ago
Helppppppppppppppppppppp
alukav5142 [94]

decameters - meters: multiply by 10

meters to meters: multiply by 1

centimeters to meters: divide by 100

millimeters to meters: divide by 1000

For the rows at the bottom:

hectometer row: 100, multiply by 100, 4500

decameter row: 10, multiply by 10, 450

meter row: 1, multiply by 1, 45

decimeter row: 0.1, divide by 10, 4.5

centimeter row: 0.01, divide by 100, 0.45

im guessing theres a millimeter row at the bottom:

millimeter row: 0.001, divide by 1000, 0.045


hope this helps!

5 0
3 years ago
Increased irrigation demands: decrease the rate of transpiration increase the rate of surface water evaporation change the amoun
drek231 [11]

Answer: Increase the rate of surface water evaporation

Irrigation is a process, in which the crops are supplied with water, to ensure their proper growth. Increased in the irrigation supply can be because of the environmental conditions like hot summer season or may be because of the type of soil is semi arid or arid means the soil does not retains moisture efficiently. This will result in increase in the rate of evaporation of the surface water.

7 0
3 years ago
When light rays appear to be coming from behind a mirror, what type of image has been formed?
Setler79 [48]
Plane is the right answer I thinkkkkk
4 0
3 years ago
Read 2 more answers
I REALLY NEED HELP can someone help me please I’ll make you brainliest ! :)
Nikitich [7]

Answer:

C

Explanation:

All thing in option c is flammable

5 0
3 years ago
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