How is light produced in an atom?
1 answer:
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Answer: -
92.4 s
Explanation: -
The decomposition reaction of a → b has a rate constant k = 0.00132 s⁻¹
From the rate constant we see that the reaction is of zero order.
The rate equation for a zero order reaction is
A₀ - A = kt
where A₀ = initial concentration.
T = time passed since start of reaction,
A is the amount present after t time passed.
A₀ = 0.156 M
A = A₀ - 78.1% of A₀
= 0.156 - x 0.156
= 0.156 - 0.122
= 0.034 M
Plugging into the formula
A₀ - A = kt
0.156 - 0.034 = 0.00132 x t
t =
= 92.4 s
t =
What is the specific heat of a substance whose mass is 7 grams, if it absorbs 180 calories to go from 10 degrees Celsius to 85 degrees Celsius
Answer:
0.343cal/g°C
Explanation:
Given parameters:
Mass of substance = 7g
Quantity of heat absorbed = 180calories
Initial temperature = 10°C
Final temperature = 85°C
Unknown:
Specific heat of the substance = ?
Solution:
To solve this problem, the specific heat of a substance is the amount of heat needed to raise the temperature of a unit mass of that substance by 1°C.
Mathematically;
C =
C is the specific heat
Q is the amount of heat
m is the mass
T is the temperature
1 and 2 are the initial and final states
Now, insert the parameters and solve;
C = = 0.343cal/g°C