Phosphorus reacts with concentrated sulfuric acid to produce phosphoric acid, sulfur dioxide and water.
aH$_2$SO$_4$ + bP $\to$ cH$_3$PO$_4$ + dSO$_2$ + eH$_2$O
a, b, c, d and e are all whole numbers.
The equation can be balanced by using oxidation numbers.
What is the value of the sum a + b + c + d + e?
1 )
10
2 )
14
3 )
15
16
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