E. Double Replacement
The OH replaces the Cl, and the Cl replaces the OH
Answer:
Uniformitarianism- A theory that geologic process that occur today are similar to those that have occurred in the past
Trace Fossil- A fossil of a foot or trail or other travel of an animal rather than of the animal itself
Answer:
1. Mass percent of ethanol = 28.02 %.
2. Mole fraction of ethanol = 0.13.
Explanation:
1. To find the mass percent we need to use the following equation:
Where:
is the mass of ethanol
is the mass of the solution
We need to calculate the mass of ethanol and the mass of the solution:
Where:
d: is the density of the solution = 0.957 g/mL
V: is the volume = 1 L
Now, from the concentration we can find the mass of ethanol:
Where:
: is the molar mass of ethanol = 46.07 g/mol
: is the number of moles of ethanol = m/M
Finally, the mass percent of ethanol is:
2. The mole fraction of ethanol is given by:
The number of moles of ethanol is:
And the moles of the solution is:
Where w is for water
Hence, the mole fraction of ethanol is:
I hope it helps you!
On a Space shuttle, LiOH Is used to absorb CO2 to produce LiHCO3
LiOH + CO2 === LiHCO3
Now
58g of CO2 produces 79.3g of LiHCO3
This is the Actual Yield.
Recall
% Yield = Actual yield/Theoretical yield x100
NOW
We have to find the theoretical yield
From the equation of reaction
Now 58g of CO2 reacted
Converting to Moles
mole = Mass/Molar Mass
Molar mass of CO2=44g/mol
Mole = 58/44
=1.318moles of CO2
From the equation Of Reaction.
1 mole of CO2 reacts and Produces 1 mole of LiHCO3
Since their Mole ratio is 1:1
An Equal amount of LiHCO3 will be produced.
So 1.318moles of LiHCO3 will be produced.
Convert this mole to Mass
Mole =Mass/Molar Mass
Mass = Mole x Molar Mas
Molar Mass of LiHCO3 =68g/mol
Mass = 1.318 x 68
Mass = 89.62g.
This is the theoretical Yield.
% yield = 79.3/89.62 x 100
= 88.48%.