Ionic solids—Made up of positive and negative ions and held together by electrostatic attractions. They're characterized by very high melting points and brittleness and are poor conductors in the solid state. An example of an ionic solid is table salt, NaCl.
Chloroplasts in the leaves
Here are the given:
<span>ΔHf° = –423 kJ/mol
</span> ΔHsub = 119 kJ/mol
IE = 469 kJ/mol
ΔHEA = –301 kJ/mol
BE = 161 kJ/mol
The lattice energy of the compound is solved using the formula:
U = <span>ΔHf° - </span>ΔHsub - BE - IE - ΔHEA
U = -423 - 119 - 161 - 469 - (-301)
U = -871 kJ/mol
Therefore, the lattice energy is 871 kJ/mol (released).
1) Determine the number of moles of chlorine gas
At STP 1 mol = 22.4 liter
=> [1mol/22.4 liter] * 0.050 liter = 0.00223 mol Cl2 (g)
2) Write the balanced equation
<span>4HCl (g) + O2 --> 2Cl2 (g) + 2H2O (g)
3) Write the ratios of the compound on which you are focused.
4 HCl : 2 mol Cl2
Then, 0.00223 mol Cl2 * [4mol HCl / 2 mol Cl2] = 0.00446 mol HCl
5) Use Avogadro's number to find the number of molecules:
0.00446 mol * 6.02*10^23 = 2.68 * 10^21 molecules of HCl
Answer: 2.68 * 10^21 molecules
</span>
Answer:
0 moles of F2
Explanation:
The equation of the reaction is given as;
3F2 + S ---> SF6
From the reaction above;
3 moles of F2 requires 1 mol of S to form 1 mole of SF6
How many moles of F2 would then require 3 mol of S ?
3 = 1
x = 3
x = 3 * 3 / 1 = 9 / 1 = 9 moles of F2
There would be no moles of F2 left as everything would be used up in the reaction.