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Find total number of electrons in \( 51 \mathrm{~g} \) of \( \mathrm{NH}_{3} \) ? If
P \( { }_{7}^{14} \mathrm{~N} \) and \( { }_{1}^{1} \mathrm{H} \) if Avogadro's No. \( =\mathrm{N}_{\mathrm{A}} \)

W
(A) \( 20 \mathrm{~N}_{\mathrm{A}} \)
(B) \( 30 \mathrm{~N}_{\mathrm{A}} \)
(C) \( 10 \mathrm{~N}_{\mathrm{A}} \)
(D) \( 5 \mathrm{~N}_{\mathrm{A}} \)
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