Why is the chemical formula magnesium sulfide written as MgS and NOT Mg2S2?
2 answers:
Explanation:
The chemical formula magnesium sulfide written as MgS and NOT because charge on magnesium ion is +2 and charge on sulfide ion is -2.
Therefore, these charges will cancel out each other as we write the formula in simplest crisscross method.
Also, the numbers in a chemical formula display the total number of atoms attached with each other or central atom.
For example, in there are two chlorine atoms attached to one calcium atom.
Therefore, denotes one sulfur atom is attached to magnesium atom. Hence, we do not write the formula of magnesium sulfide as
because this shows two magnesium atoms are attached to two sulfur atoms which is not true.
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Answer:
-100 kJ
Explanation:
We can solve this problem by applying the first law of thermodynamics, which states that:
where:
is the change in internal energy of a system
Q is the heat absorbed/released by the system (it is positive if absorbed by the system, negative if released by the system)
W is the work done by the system (it is positive if done by the system, negative if done on the system)
For the system in this problem we have:
W = +147 kJ is the work done by the system
Q = +47 kJ is the heat absorbed by the system
So , its change in internal energy is: