A few days ago
Can you help me pleaase?
when determining the formula for a compound it is important to know the valence numbers of each element. supppose that the element A has a valence number of 3 and element B has a number of 2. if the two elements combine, then when writing the formula for the resultating compound what subscript number will be given to elememt B
A 1
B 2
C 3
D 5
thank you so much and god bless you
Top 1 Answers
A few days ago
Favorite Answer
If A has valency 3 and B has valency 2, then you can regard each atom of A as having 3 ‘hooks’ and each atom of ‘B’ as having 2 ‘hooks’.
When A and B combine, there must be no hooks unused.
You therefore need to find a number which is a multiple of both 2 and 3.
As 2 and 3 are both prime, the smallest such number is 3 * 2 = 6.
To get 6 hooks in total on the A atoms, you need 2 atoms.
To get 6 hooks in total on the B atoms, you need 3 atoms.
The simplest or ’empirical’ formula of the compound is therefore A[2]B[3].
Answer C.
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