The following reaction is exothermic. 2 N2O(g) 2 N2(g) O2(g) This means the reaction: 56) A) will be spontaneous only at low tem
1 answer:
For exothermic processes, spontaneity will only occur if the entropy positive with all temperature or if the entropy is negative with only low temperature.
Since the given equation decomposed from 2 moles of gas into 3 moles of gas, we know that entropy is positive. Thus the reaction will be spontaneous at all temperature.
D is the answer
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6.15 × 10²⁴
Explanation:
To find the number of atoms, divide the mass of calcium (m) by its molar mass (MM). This will give you the number of moles of calcium (n).
Start with a formula
Substitute values from the question
Simplify
Cancel out the units "g"
Number of moles of calcium, with 4 significant figures
Then, multiply the number of moles of calcium (n) by Avogadro's number () to find the number of calcium atoms.
Start with a formula
Substitute values from the question
Simplify
Cancel out the units "mol"
Multiply, leave one extra digit to help round. "4" tells you to round down.
Final answer to 3 significant figures*
*When multiplying and dividing numbers, your final answer will have the same number of significant figures as the number with the least number of significant figures in the question.
40.08 has 4 significant figures. 41.0 has 3 significant figures. So, you want 3 significant figures in your final answer.
I hope this helps!
Learn more about Avogadro's number here:
Check out another answer that uses significant figures:
Explanation:
An alpha particles is basically a helium nucleus and it contains 2 protons and 2 neutrons.
Symbol of an alpha particle is . Whereas a neutron is represented by a symbol
, that is, it has zero protons and only 1 neutron.
Therefore, reaction equation when an aluminum- nuclide transforms into a phosphorus- nuclide by absorbing an alpha particle and emitting a neutron is as follows.