Answer:
[Na+] = 0.1528 M
[S^2-] = 0.0764 M
Explanation:
Step 1: Data given
MAss of Na2S = 5.96 grams
Volume of solution = 1.00 L
Molar mass Na2S = 78.045 g/mol
Step 2: Calculate moles Na2S
Moles Na2S = Mass Na2S / molar mass Na2S
Moles Na2S = 5.96 grams / 78.045 g/mol
Moles Na2S = 0.0764 moles
Step 3: Calculate moles ions
For 1 mol Na2S we have 2 moles Na+ and 1 mol S^2-
For 0.0764 moles Na2S we have 0.0764 moles S^2- and 2*0.0764 = 0.1528 moles Na+
Step 4: Calculate concentration of ions
[Na+] = 0.1528 moles / 1 L = 0.1528 M
[S^2-] = 0.0764 moles / 1L = 0.0764 M
Answer:
Mole fraction of C₄H₄S = 0.55
Explanation:
Mole fraction is moles of solute / Total moles
Total moles are the sum of moles of solute + moles of solvent.
Let's find out the moles of our solute and our solvent.
Mass of solute: 55g
Mass of solvent: 65g
Mol = Mass / molar mass
55 g / 84.06 g/mol = 0.654 moles of C₄H₄S
65 g /123 g/mol = 0.529 moles of C₂H₃BrO
Total moles = 0.654 + 0.529 = 1.183 moles
Mole fraction of thiophene = Moles of tiophene / Total moles
0.654 / 1.183 = 0.55
<h3><u>Answer</u>;</h3>
A. When a reaction is at chemical equilibrium, a change in the system will cause the system to shift in the direction that will balance the change and help the reaction regain chemical equilibrium.
<h3><u>Explanation</u>;</h3>
- Le Chatelier's principle states that when a change or a "stress" is placed on a system that is at equilibrium, the system will shift in such a way to relieve that change or stress.
- The stresses include; changing the concentration of reactants or products, altering the temperature in the system and changing the pressure of the system.
- Therefore; <u><em>when a chemical reaction is at equilibrium and experiences a change in pressure, temperature, or concentration of products or reactants, the equilibrium shifts in the opposite direction to offset the change. </em></u>
Answer:
D: chain of volcanoes circling the Pacific Basin
Explanation:
Answer:
C) a low heat of vaporization.
Explanation:
It is C) a low heat of vaporization.
Low heat of vaporization means less amount of energy is required to vaporize a liquid. This further means the liquid has weaker intermolecular force of attraction that is why on provide lesser heat only it vaporizes.
Low vapor pressure, high boiling point and high critical temp. all contribute to strong intermolecular forces in a liquid
