<span>Astatine-217 is the daughter element produced by the alpha decay of Francium-221.</span>
Given molecule Lithium iodide (LiI)
Heat of hydration = -793 kj/mol
Lattice energy = -730 kJ/mol
Heat of hydration = Heat of solution - Lattice energy
Heat of solution = Hydration + Lattice = -793 + (- 730) = -1523 kJ/mol
Now,
Mass of LiI = 15.0 g
molar mass of LiI = 134 g/mol
# moles of LiI = 15/134 = 0.112 moles
Heat of solution for 1 mole of LiI = -1523 KJ
Therefore, for 0.112 moles of LiI the corresponding heat is
= 0.112 *(-1532) = 171.6 kJ
Answer:
An atom
Explanation:
Because an ion is smaller than an atom and if we're talking about ions, iron would be called a Nitride ion or N3-ion, so ion come from atoms and saying that nitrogen is an atom.
Answer : The approximate atomic mass of an oxygen atom daltons (Da) is, 16 Da
Explanation :
As we know that dalton (Da) is equal to atomic mass unit (amu).
As we are given that,
Element = oxygen
Atomic number of oxygen = 8
As we know that the atomic mass of oxygen = 16 amu
So, the approximate atomic mass of an oxygen atom in daltons (Da) = Atomic mass unit of oxygen = 16 amu = 16 Da
Thus, the approximate atomic mass of an oxygen atom daltons (Da) is, 16 Da
