## Chemistry: The Central Science (13th Edition)

$3Mg(s)+N_2(g)\rightarrow Mg_3N_2(S)$ This is combination.
$Mg(s)+N_2(g)\rightarrow Mg_3N_2(S)$ This is a combination reaction because two elements are combining to form a compound. Add a coefficient of 3 to $Mg$ to balance the equation. $3Mg(s)+N_2(g)\rightarrow Mg_3N_2(S)$