120o. The polyatomic ion is planar with a trigonal molecular geometry, a nitrogen atom with 3 equidistant O atoms at near 122 pm. All predictable ny VSEPR. The short bond length is attributed to pi bonding, the negative charge is spread across the three O atoms.
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NI(NO3)3+pbbr4nibr3+pb(no3)4
Ba(NO3)2The total mass for this molecule is 261gso what is 261g/132g this is 1.97moles
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no3³ = 274³ = 64if it is then somewhere between 3 and 4
The oxidation number of nitrogen in the nitrate ion NO3- is 5