The reaction that will result in a decrease in entropy is:
- N₂(g) + 3H₂(g) → 2NH3(g).
<h3>What is entropy of a substance?</h3>
Entropy is a measure of the degree of randomness of a substance.
An increase in entropy means an increase in disorderliness whereas a decrease in entropy means an increase in orderliness.
A change of state from gas to liquid or gas to solid or liquid to solid means a decrease in entropy value.
Also, a decrease in the moles of a gas after a reaction means a decrease in entropy.
Therefore, the reaction that will result in a decrease in entropy is:
N₂(g) + 3H₂(g) → 2NH3(g).
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Answer:
the energy required is Q = 4.9 kJ
Explanation:
Since the energy required is
Q = L * n
where L = molar enthalpy of fusion of solid sodium = 2.60 kJ/mol
and n = number of moles involved
also we know that
n= m/ M , where m= mass involved , M = molecular weight of sodium
the molecular weight of sodium is M= 23 g / mol
therefore
Q = L * n = L* m / M
replacing values
Q = L* m / M = 2.60 kJ/mol * 43.6 g/ (23 g / mol) = 4.9 kJ
Q = 4.9 kJ
thus the energy required is Q = 4.9 kJ
Answer:
It will become a red giant
Explanation:
When the sun runs out of its hydrogen fuel and the hydrogen atoms are combined together to make helium atoms, it expands into a red giant, which is made up of helium atoms and gases.
The number of silicon atoms in atypical computer chips(0.001g of silicon) is 2.14 × 10¹⁹ atoms
The atomic mass of silicon = 28.0855 amu
Using the mole concept that 1 mole = 6.022 × 10²³.
This number is called the Avogadro's number.
Therefore,
1 mole / 28.0855g of silicon contains 6.022 × 10²³ atoms of silicon
0.001 g will contain ? atoms of silicon
cross multiply
number of atoms of silicon = 6.022 × 10²³ × 0.001 / 28.0855
number of atoms of silicon = 6.022 × 10²⁰ / 28.0855
number of atoms of silicon = 2.14 × 10¹⁹ atoms
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Answer:
Cobalt (Co)
Explanation:
3d^7 is the location of Cobalt's last electron.
