Ac sample of octane that has a mass of 0.750 g is burned in a bone calorimeter. As a result, the temperature if the calorimeter
2 answers:
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Draw the Lewis structure for the molecule containing two H and one Se atoms.How many single bonds ,double bonds, triple bonds, and unshared pairs of electrons are on the central atom, in that order?
1)3, 0, 0, 1
2)1, 0, 1, 0
3)0, 1, 1, 0
4)0, 2, 0, 0
5)2, 0, 0, 2
6)1, 1, 0, 1
7)4, 0, 0, 0
8)None of these
9)0, 0, 1, 1
10)2, 1, 0, 0
Answer:
The correct answer is (5) 2, 0, 0, 2
(Lewis structure in attached image)
Explanation:
In , the central atom Se is attached to two H atoms. Se has 6 valence electrons while hydrogen has one valence electron and since there are two hydrogen atoms,there will be 2 valence electrons for two hydrogen atoms. Therefore there are 8 valence electrons in total
Se= 1 × 6
H= 2 × 1
total valence electrons= 8
Thus the lewis structure will be as drawn in the attached image.
There are 2 single bond, no double bond, no triple bond, and 2 unshared pairs of electrons hence the correct answer from the options is 2, 0, 0, 2
