Multiple Choice
What is the oxidation state of boron in Na2B4O7?
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Calculate Oxidation Numbers
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In the compound NH3, what must nitrogen's oxidation state be?
A
+3
B
-3
C
0
D
+5
Verified step by step guidance1
Recall that the sum of oxidation states in a neutral compound must be zero.
Assign the oxidation state of hydrogen as +1, since hydrogen is usually +1 when bonded to nonmetals.
Let the oxidation state of nitrogen be x. Since there are three hydrogens, the total contribution from hydrogen is 3 \times (+1) = +3.
Write the equation for the sum of oxidation states: x + 3 = 0.
Solve for x to find the oxidation state of nitrogen: x = -3.
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