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weeeeeb [17]
3 years ago
11

PLEASE HELPPPPPPPPP MEEEEEEEEEEE!!!!!

Chemistry
2 answers:
vazorg [7]3 years ago
6 0

Due to the fact that we must find the weight in 300 years, we must find the weight of the element in 3 half-lives. In order to do this, we must divide the original number, 1 kilo, by 1/8 to find the quantity left. 1 kilo = 1000 grams, 1000 g / 1/8 = 125g. This means that the answer should be D.

I hope I've helped! :)

Andrew [12]3 years ago
3 0

Option (d) would be correct

To find the weight of the radioactive element in 300 years, we find its weight in 3 half-lives

Now all you got to do is divide the given weight by 8, it's that easy!

But remember to take the weight in GRAMS

Therefore, you will have 1000/8 = 125 g

(We took 1000 because 1 kg = 1000 g)

And yeah, you can mark H1storyBuff as the 'Brainliest' :)

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9. How long will it take 120 grams of Strontium-90 to decay to 7.5 grams?<br>with steps pls​
ryzh [129]

Answer:

116 years

Explanation:

To solve this, we will use the half life equation;

A(t) = A_o(½)^(t/t_½)

Where;

A(t) is the amount of strontium left after t years;

A_o is the initial quantity of strontium that will undergo decay;

t_½ is the half-life of strontium

t is the time it will take to decay

We are given;

A(t) = 7.5 g

A_o = 120 g

From online values, half life of strontium-90 is 29 years. Thus, t_½ = 29

Thus;

7.5 = 120 × ½^(t/29)

Divide both sides by 120 to get;

7.5/120 = ½^(t/29)

0.0625 = ½^(t/29)

In 0.0625 = (t/29) In ½

-2.772589 = (t/29) × (-0.693147)

(t/29) = -2.772589/(-0.693147)

t/29 = 4

t = 29 × 4

t = 116 years

5 0
3 years ago
What keeps the stars in the galaxy from moving apart??
Vikki [24]
I think it is gravity
7 0
4 years ago
Element X had a mass of 300g and a 1/2 life of 10 years. how many grams will remain after 40 years?
kiruha [24]
<h3>Answer:</h3>

18.75 grams

<h3>Explanation:</h3>
  • Half-life refers to the time taken by a radioactive material to decay by half of the original mass.
  • In this case, the half-life of element X is 10 years, which means it takes 10 years for a given mass of the element to decay by half of its original mass.
  • To calculate the amount that remained after decay we use;

Remaining mass = Original mass × (1/2)^n, where n is the number of half-lives

Number of half-lives = Time for the decay ÷ Half-life

                                 = 40 years ÷ 10 years

                                  = 4

Therefore;

Remaining mass = 300 g × (1/2)⁴

                            = 300 g × 1/16

                             = 18.75 g

Hence, a mass of 300 g of an element X decays to 18.75 g after 40 years.

3 0
4 years ago
Label the signals due to ha, hb, and hc in the 1h nmr spectra.
trapecia [35]
Structure along with ¹H-NMR is shown below.

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Signal for Hb;
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Signal for Hc;
                     Based on multiplicity of of the peak, a Triplet peak (the only triplet peak present in spectrum) at 1.1 ppm was assigned to Hc. As the methyle group in coupling with methylene group having two protons so it gave a Triplet peak.

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What biochemical reaction??
4 0
4 years ago
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