The electron cloud of HF is smaller than that of F2, however, HF has a much higher boiling point than F2 has. Which of the follo
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Answer:
The initial concentration of ammonia is 0.14 M and the pH of the solution at equivalence point is 5.20
<u>Explanation:</u>
To calculate the number of moles for given molarity, we use the equation:
.....(1)
Molarity of HCl solution = 0.164 M
Volume of solution = 23.8 mL = 0.0238 L (Conversion factor: 1 L = 1000 mL)
Putting values in equation 1, we get:
The chemical equation for the reaction of ammonia and HCl follows:
By Stoichiometry of the reaction:
1 mole of HCl reacts with 1 mole of ammonia
So, 0.0035 moles of HCl will react with = of ammonia
- Calculating the initial concentration of ammonia by using equation 1:
Moles of ammonia = 0.0035 moles
Volume of solution = 25 mL = 0.025 L
Putting values in equation 1, we get:
By Stoichiometry of the reaction:
1 mole of ammonia produces 1 mole of ammonium ion
So, 0.0035 moles of ammonia will react with = of ammonium ion
- Calculating the concentration of ammonium ion by using equation 1:
Moles of ammonium ion = 0.0035 moles
Volume of solution = [23.8 + 25] mL = 48.8 mL = 0.0488 L
Putting values in equation 1, we get:
- To calculate the acid dissociation constant for the given base dissociation constant, we use the equation:
where,
= Ionic product of water =
= Acid dissociation constant
= Base dissociation constant =
The chemical equation for the dissociation of ammonium ion follows:
The expression of for above equation follows:
We know that:
Putting values in above expression, we get:
To calculate the pH concentration, we use the equation:
We are given:
Hence, the initial concentration of ammonia is 0.14 M and the pH of the solution at equivalence point is 5.20
There are 11 Carbon atoms in the compound.
<u>Solution:</u>
Carbon atom count is the ratio of the M peak to the M+1 peak.
Here M peak is 57.10% and M+1 peak is 6.83%. On applying the values in the formula we get,
Therefore, the number of Carbon atoms in the compound are 11.
Refer the image attached below for a better understanding of M peak and M+1 peak.
The heaviest ion that has the greatest m/z value is said to be the molecular ion peak in mass spectrum.
Answer:
Lead shows the greatest temperature change upon absorbing 100.0 J of heat.
Explanation:
Q = Energy gained or lost by the substance
m = mass of the substance
c = specific heat of the substance
ΔT = change in temperature
1) 10.0 g of copper
Q = 100.0 J (positive means that heat is gained)
m = 10.0 g
Specific heat of the copper = c = 0.385 J/g°C
2) 10.0 g of aluminium
Q = 100.0 J (positive means that heat is gained)
m = 10.0 g
Specific heat of the aluminium= c = 0.903 J/g°C
3) 10.0 g of ethanol
Q = 100.0 J (positive means that heat is gained)
m = 10.0 g
Specific heat of the ethanol= c = 2.42 J/g°C
4) 10.0 g of water
Q = 100.0 J (positive means that heat is gained)
m = 10.0 g
Specific heat of the water = c = 4.18J/g°C
5) 10.0 g of lead
Q = 100.0 J (positive means that heat is gained)
m = 10.0 g
Specific heat of the lead= c = 0.128 J/g°C
Lead shows the greatest temperature change upon absorbing 100.0 J of heat.