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uysha [10]
2 years ago
9

SOMEONE PLEASE HELP HURRY

Chemistry
1 answer:
melomori [17]2 years ago
4 0

I think the answer is A. I know it's Planet X.

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The half-life of cesium-137 is 30 years. Suppose we have a 200-mg sample. (a) Find the mass that remains after t years.
scZoUnD [109]

Given:

Half life(t^ 1/2) :30 years

A0( initial mass of the substance): 200 mg.

Now we know that

A= A0/ [2 ^ (t/√t)]

Where A is the mass that remains after t years.

A0 is the initial mass

t is the time

t^1/2 is the half life

Substituting the given values in the above equation we get

A= [200/ 2^(t/30) ] mg


Thus the mass remaining after t years is [200/ 2^(t/30) ] mg

5 0
3 years ago
Name the following Compound: CrF2
pav-90 [236]
Chromium(II) fluoride
8 0
2 years ago
Which of the following has the correct name for either the acid or base
Vlad1618 [11]

Answer:

Explanation:

harmless

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6 0
3 years ago
Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body. What is the molar
nata0808 [166]

Answer:

The molar mass of lysine using the ideal gas equation for this problem is 146.25 g/mole.

Explanation:

The ideal gas equation PV = nRT, was derived from the ABC laws (Avogadros, Boyles and Charles laws). We need to obtain the value for the number of moles n.

The parameters of this equation are:

P = 1.918 atm

V = 750.0mL = 0.75L

n = ?

R = 0.0821

T = 25 degree celcius = 25 + 273 = 298 degree kelvin.

From this formular, n = (PV)/(RT)

n = (1.918 X 0.75)/(0.0821 X 298 )

n = 0.0588

n, no of mole = mass/molar mass

0.0588 = 8.6/MM

MM = 8.6/0.0588

MM = 146.25g/mole.

4 0
3 years ago
Read 2 more answers
Which is the scientific notation for 8,002.5 seg?
Blizzard [7]
8,002.5 would be written as 
8.0025 x 10 and 3
because you move the decimal place 3 times to the left.
7 0
3 years ago
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