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lawyer [7]
3 years ago
13

What is the reaction energy q of this reaction? use c2=931.5mev/u. express your answer in millions of electron volts to three si

gnificant figures?
Chemistry
1 answer:
Ann [662]3 years ago
5 0
₉₂U²³⁵ + ₀n¹ → ₅₄Xe¹⁴⁰ + ₃₈Sr⁹⁴ + 2 ₀n¹
Mass of reactants = 235.04393 + 1.008665 = 236.052595 amu
Mass of products = 139.92144 + 93.91523 + 2* (1.008665) = 235.854000 amu
Mass defect Δ m = 236.052595 - 235.854000 = 0.198 amu
Reaction energy released Q = Δ m * 931.5
                                              = 0.198 * 931.5 = 185 MeV
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50 pennies or other coins (all coins must be the same value)
Neko [114]

Hey!

Hope this helps...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Question 1: <em>Turn 25 coins tails up. You now have 50% parent material and 50% daughter material. What is the half life of this substance? (20 Points)</em>


Answer:

Based upon the given information, we can assume that the half life of this coin material is 5 years.



Question 2: <em>Imagine that another half life has gone by. Remember that ONLY the parent material can change to the daughter material. Turn over your pennies to represent the passing of another half life. How much total parent material and how much total daughter material do you now have? You may express your answer in number of pennies or in %. (Note: Since you cannot turn over half a penny, round the actual number of pennies you would turn over up.) (20 points)</em>


Answer:

Based upon the given information from Question 2 and Question 3, we can assume that 13 additional coins would be turned over.  We started with 50, than flipped 50% of them over, and now another 50% over.  We have 12 coins left.



Question 3: <em>How many half lives will pass before you have only 3 pennies that are parent material and 47 pennies that are daughter material? (20 Points)</em>


Answer:

Based upon the given information from all the questions, and based upon our answers we can assume this:

1st half-life: 50 turned to 25 coins

2nd half-life: 25 turned to 12 coins

3rd half-life: 12 turns to 6 coins

4th half-life: 6 turns to 3 coins

So, after 4 half-lives (or after 20 years) we would have 3 coins left that have parent material.

------------------------------------------------------

<em>For future reference please do not post as complex questions like this, if you do (post a question that is similar to this) please state the following information:</em>

<em>"All questions posted in this post relate to one-another and cannot be answered without the other questions..."</em>

4 0
3 years ago
What property of air allows it to flow down to the floor?​
Mandarinka [93]

I am not sure about my answer, but I think that it's density allows it to fall to the ground/floor.

5 0
3 years ago
Though hydrochloric acid is formed inside our body, it is not called organic acid. Why?​
Sphinxa [80]

Explanation:

Hydrochloric acid does not consider as organic acid because of the absence of carbon in it.

hope it helps

6 0
3 years ago
A 28.8 mL sample of HCl is titrated with NaOH. If 39.5 mL of 0.639 M NaOH is needed to reach the endpoint, what is the concentra
zaharov [31]

Answer:

0.8764 M

Explanation:

Equation of the reaction:

NaOH + HCl --> NaCl + H2O

Number of moles = molar concentration × volume

= 0.039 × 0.639

= 0.0252 mol

By stoichiometry, 1 mole of HCl reacted with 1 mole of NaOH. Therefore, number of moles of HCl = 0.0252 mol

Molar concentration of HCl = number of moles ÷ volume

= 0.0252 ÷ 0.0288

= 0.8764 M of HCl.

6 0
3 years ago
Select the correct answer<br><br> Giving brainliest
Kobotan [32]

Answer:

D

Explanation:

6 0
2 years ago
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