CALCULATE THE PROBLEM

label Chemistry
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May 20th, 2015

DATA:

Mass of water= 67.5g

∆T = 98.5C0 – 25C0 = 73.5C0

Change in energy (∆Q)=?

SOLUTION:

∆Q = mC∆T

For Q

∆Q = mC∆T

  = (67.5) (4.186) (73.5)

  = 20767.79J

  = 20.7677KJ

QUESTION 2:

since you haven't provided complete question, i am giving you the general information for Cs-137. if you need more you can ask.

*it's isotope mass is 136.9070 u

*it's half-life is 30.17 years

* it is easily soluble in water, so there is a high risk of it's poisoning.

* it is used in medicine (radiation therapy), industries (calibrate radiation-detection equipment) and in other fields.

May 20th, 2015

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