Answer:
i) 16 mL of ethanol
ii) maximum amount recoverable = 15.52 g; percentage recovery = 97%
iii) maximum amount recoverable = 15.1 g
percentage recovery = 94.4%
Explanation:
Solubility = mass/volume
i) mass of ethanol recovered per mL of ethanol when cooled from 78 °C to 0 °C = 0.13 - 0.03 = 0.10 g
Therefore 1.60 g of Y will require a minimum of 1.60 x 1 mL/0.10 g = 16 mL of ethanol
ii) maximum amount of Y that can be recovered is given as :
mass of Y left in solution after recrystallization, x is obtained
0.03 g/mL = x g/16 mL
x = 0.48 g
maximum amount recoverable = 16 - 0.48 = 15.52 g
percentage recovery = (15.52/16) x 100 % = 97%
iii) if 30 mL of ethanol were used:
mass of Y left in solution after recrystallization, x is obtained;
0.03 g/mL = x g/30 mL
x = 0.03 x 30 = 0.9 g
maximum amount recoverable = 16 - 0.9 = 15.1 g
percentage recovery = (15.1/16) x 100% = 94.4%
Answer:
A
Explanation:
bcuz the water in it is little
1.694 L
Explanation:
First, solve for the number of moles of HCl in a 450-ml 3.2M solution:
# of mol HCl = (3.2 mol HCl/L)(0.450 L)
= 1.44 mol HCl
The molarity M is given by
M = (# of moles)/(volume in L)
Solving for the volume,
V = (# of moles)/M
= (1.44 mol HCl)/(0.85M)
= 1.694 L
Therefore, the 3.2M HCl solution must be diluted until its volume becomes 1.694 L.
The Equator is where the doldrums are found.
Cd + 2HCl → CdCl₂ + H₂, 2ZnS + 3O₂ → 2ZnO + 2SO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O reactions are redox reaction.
<h3>What is redox reaction?</h3>
Redox reactions are those reactions in which oxidation and reduction process takes place simultaneously.
Above balanced equation is a redox reaction as in this reaction oxidation of Cadmium takes place from 0 to+2 state and reduction of hydrogen takes place from +1 to 0 state.
- CuCl₂ + Na₂S → 2NaCl + CuS
- CaCO₃ → CaO + CO₂
Above two balanced reaction are not the redox reaction as their is no oxidation or reduction takes place.
Above balanced equation is a redox reaction as in this reaction oxidation of sulfur takes place from -2 to+4 state and reduction of oxygen takes place from 0 to -2 state.
Above balanced equation is a redox reaction as in this reaction oxidation of carbon takes place from -4 to+4 state and reduction of oxygen takes place from 0 to -2 state.
Hence, Cd + 2HCl → CdCl₂ + H₂, 2ZnS + 3O₂ → 2ZnO + 2SO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O reactions are redox reaction
To know more about redox reaction, visit the below link:
brainly.com/question/26263317