Answer:
The value of equilibrium constant is 29.45.
Explanation:
Moles of hydrogen gas = 2.00 mol
Concentration of hydrogen gas =
Moles of iodine gas = 1.00 mol
Concentration of iodine gas =
initially
2.00 M 1.00 M 1.00 M
At equilibrium:
(2.00-x/2) (1.00-x/2) x
Moles of HI at equilibrium = 1.80 M
Concentration of HI at equilibrium =
The expression of an equilibrium constant is given by ;
Putting x equal to 1.80 M.
The value of equilibrium constant is 29.45.
The dissolution of CaCl2 in water has an equation written as:
CaCl2 = Ca2+ + 2Cl-
First, we need to calculate how many moles of Cl- we need from the volume and concentration to be used.
mol Cl- needed = 0.0520 mol / L Cl- (2.15 L) = 0.1118 mol Cl-
We can now find how much of the CaCl2 we need as follows:
0.1118 Cl- ( 1 mol CaCl2 / 2 mol Cl-) ( 111.1 g / 1 mol) = 6.21 g CaCl2
Answer:
3.125 grams.
Explanation:
- It is known that the decay of a radioactive isotope isotope obeys first order kinetics.
- Half-life time is the time needed for the reactants to be in its half concentration.
- If reactant has initial concentration [A₀], after half-life time its concentration will be ([A₀]/2).
- Also, it is clear that in first order decay the half-life time is independent of the initial concentration.
∵ Thulium-167 has a half life of 9.0 days.
∴ The time is needed to calculate the grams are left after (36.0 days) represents (36.0 days / 9.0 days) = 4.0 half-lives.
50.0 grams → (first half life) 25.0 grams → (second half life) 12.5 grams → (third half life) 6.25 grams → (fourth half life) 3.125 grams.
So, the grams are left after 36.0 days = 3.125 grams.
Taking into account the definition of potencial energy, the object's mass is 14.96 kg.
<h3>Potential energy</h3>
Potential energy is the energy that measures the ability of a system to perform work based on its position. In other words, this is the energy that a body has at a certain height above the ground.
Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the force of gravity.
Then the expression applied to the gravitational energy of the object is:
Ep= m×g×h
where:
- Ep is the potential energy in joules (J).
- m is the mass in kilograms (kg).
- h is the height in meters (m).
- g is the acceleration of fall in m/s² (approximately 9.81 m/s²).
<h3>Object's mass</h3>
In this case, you know:
- Ep= 734 J
- m= ?
- g= 9.81 m/s²
- h= 5 m
Replacing in the definition of potential energy:
734 J= m× 9.81 m/s² ×5 m
Solving:
734 J= m× 49.05 m²/s²
m= 734 J÷ 49.05 m²/s²
<u><em>m= 14.96 kg</em></u>
Finally, the object's mass is 14.96 kg.
Learn more about potential energy:
<u>brainly.com/question/15896499</u>
<u>brainly.com/question/14525402</u>
<u>brainly.com/question/24933254</u>