An object starts at position 12 on a horizontal line with a reference point of 0. What is the position of the object if it moves
14 units to the left?
2 answers:
Answer:
The position of the object is
Explanation:
I add a picture of the situation in order to explain the question.
We are going to state the ''zero'' on a horizontal line. Then, we are going to state as positive the sense from left to right.
Now, if the object moves 14 units to the left , we need to subtract to the original position 14 units (because it will be a negative move given that the object is moving to the left) ⇒
It new position will be at .
In general, the first step to solve this kind of exercises is to set a reference system. Then, it is very important to draw the situation.
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Answer:
The activation energy for this reaction, Ea = 159.98 kJ/mol
Explanation:
Using the Arrhenius equation as:
Where, Ea is the activation energy.
R is the gas constant having value 8.314 J/K.mol
K₂ and K₁ are the rate constants
T₂ and T₁ are the temperature values in kelvin.
Given:
K₂ = 8.66×10⁻⁷ s⁻¹ , T₂ = 425 K
K₁ = 3.61×10⁻¹⁵ s⁻¹ , T₁ = 298 K
Applying in the equation as:
Solving for Ea as:
Ea = 159982.23 J /mol
1 J/mol = 10⁻³ kJ/mol
Ea = 159.98 kJ/mol