Mr(NO₃⁻) = Ar(N) * N(N) + Ar(O) * N(O) = 14 * 1 + 16 * 3 = 62;
Mr(8NO₃⁻) = Mr(NO₃⁻) * 8 = 62 * 8 = 496.
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Mr(NO₃⁻) = Ar(N) * N(N) + Ar(O) * N(O) = 14 * 1 + 16 * 3 = 62;
Mr(8NO₃⁻) = Mr(NO₃⁻) * 8 = 62 * 8 = 496.