Answer:
6,41 min
Explanation:
For the reaction:
A → products
kinetics first-order reaction law is:
ln[A] = ln[A]₀ -kt
Where [A] is concentration of reactant, [A]₀ is initital concentration of reactant, k is rate constant and t is time.
If the concentration of A is 6,25% you can assume:
[A] = 6,25; [A]₀= 100. Replacing:
ln(6,25) = ln(100) -7,20×10⁻³s⁻¹t
-2,7726 = -7,20×10⁻³s⁻¹t
385s = t
In minutes:
385s× = <em>6,41 min</em>
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I hope it helps!
The protons contribute significantly more to an atom's mass because sodium has an atomic number of 11, where the number of protons in a neutral sodium atom is equal to the number of electrons. In the first group or column of the periodic table, sodium is an alkali metal.
The sodium atom mass has 11 protons and electrons, and its outermost shell has one valence electron. Pure sodium has a high level of reactivity. Since it is such a soft metal, a knife may be used to cut it with ease. The chemical element sodium has the atomic number 11 and the symbol Na.
To learn more about sodium, click here.
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Answer:
Hf = 396.007 J/g
Explanation:
Q = 2083J
Mass = 5.26g
Q = m*Hf
Q = energy
M = mass of aluminium
Hf = heat of fusion
Q = mHf
Hf = Q / m
Hf = 2083 / 5.26
Hf = 396.007 J/g
The heat of fusion of aluminium is 396.07 J/g