Selenium (Se) has 30 protons and 20 neutrons in each atom, therefore its atomic
1 answer:
Answer:
30, 50
Explanation:
Hello,
In this since an element's atomic number is equal to the number of protons in its atom, we can infer that selenium's atomic number is 30. Moreover, due to the fact the the neutrons are equal to the atomic mass minus the atomic number or the number of protons, by knowing the number of neutrons we compute the atomic as follows:
Thus, answer is 30, 50.
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Answer: Molar heat of solution for the salt is 2563 kJ/mol
Explanation:
Let the heat absorbed during reaction be q.
q = Heat gained by solution = ?
m = Mass of water + mass of salt = 100.000 g + 5.556 g = 105.556 g
c = Heat capacity of solution = Heat capacity of water = 4.184 J/g°C
Change in temperature = ΔT = (80.000°C-11.517°C) = 68.483°C
0.01180 moles of salt absorbs = 30245.3 J
1 mole of salt absorbs = of heat
Thus molar heat of solution for the salt in kJ/mol is 2563