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Deffense [45]
3 years ago
11

The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown below

?
7Li
Chemistry
1 answer:
Mademuasel [1]3 years ago
5 0
If it is not an isotope then it has around 21 neutrons
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A certain reaction with an activation energy of 205 kj/mol was run at 485 k and again at 505 k . what is the ratio of f at the h
lapo4ka [179]
Arrhenius' Law relates activation energy, Ea, rate constant, K, and temperature, T as per this equation:

K (T) = A * e ^ (-Ea / RT), where R is the universal constant of gases and A is a constant which accounts for collision frequency..

Then you can find the ration between K's at two different temperatures as:

K1 = A * e ^ (-Ea / RT1)

K2 = A* e ^(-Ea / RT2)

=> K1 / K2 = e ^ { (-Ea / RT1) - Ea / RT2) }

=> K1 / K2 = e ^ {(-Ea/ R ) *( 1 / T1 - 1 T2) }

=> K1 / K2 = e^ { (-205,000 j/mol / 8.314 j/mol*k )* ( 1 / 505K - 1/ 485K) }

=> K1 / K2 = e ^ (2.0134494) ≈ 7.5

Answer: 7.5




8 0
3 years ago
If you answer in 10 minutes you'll get 50 points
lisabon 2012 [21]

Answer:

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Explanation:

5 0
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Which of the following NOT a principle of deep ecology, according to Arne Naess? All life has intrinsic value Environment must b
motikmotik

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On the picture are all principles cited on wikipedia.

Explanation:

So the answer is

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