<h3> Part A</h3>
The molar mass of silver = 107.87 g/mol ( <em>from periodic table)</em>
<h3>
part B</h3>
The moles of silver is 0.2946 moles
<u><em>calculation</em></u>
moles =mass÷ molar mass
= 31.78 g ÷ 107.87 =0.2946 moles
<h3>part c</h3>
The number of atoms of silver that are in this sample is 1.773 x 10²³ atoms
<u><em>calculation</em></u>
According to Avogadro's law 1 mole = 6.02 x 10²³ atoms
0.2946 moles= ? atoms
by cross multiplication
= [ (0.2946 moles x 6.02 x 10²³ ) / 1 mole] = 1.773 x 10²³ atoms
No, its a highly desirable material that is hypothetical, scientifically impossible, extremely rare, costly, or fictional.
The enthalpy change accompanying the reaction of 0.95 g of S is -11.85 kJ
<h3>Further explanation</h3>
Given
ΔH° for the reaction is -790 kJ
Required
The enthalpy change
Solution
Reaction
2S (s) + 3O₂(g) = 2SO₃ (g)
mol of S(MW=32 g/mol) :
For 2 mol S, the entalphy = -790kJ
The enthalpy change for 0.03 mol :
Answer: The student observed only one liquid phase because The student removed the aqueous layer instead of the organic layer and then added organic solvent to more organic layer. Diethyl ether is less dense than water.
Explanation:
In organic chemistry, which is the chemistry of carbon atoms, liquid-liquid extraction techniques are used to separate solutes from its crude reaction mixtures. An example of liquid- liquid extraction technique used is the Separatory funnel.
The Separatory funnel extraction technique allows the separation of solutes based on their solubilities in two immiscible liquids. This appears as two phases or layers with the organic solvent on top while the aqueous solution is below the funnel. This is because the organic solvents are less dense than the aqueous solution.
From the question, the student had a dissolved organic compound in an aqueous solution and was given an organic solvent, diethyl ether for its extraction. When the first 10ml of ether was added, the dissolved organic compound mixed with it and remained in the top layer of the mixture. The student removes the lower layer after the first extraction and adds the second 10mL portion of ether to the upper layer remaining in the separatory funnel. After shaking the funnel, the student observes only one liquid phase with no interface because more organic solvent was added to the organic layer that remained after the aqueous layer was removed.
