已知等差数列\(\{a_{n}\}\)中，\(a_{3}=13\)，\(a_{6}=25\)
\((\)Ⅰ\()\)求\(\{a_{n}\}\)的通项公式；
\((\)Ⅱ\()\)令\(b_{n}=2\;^{a_{n}}\)，求证数列\(\{b_{n}\}\)是等比数列，并求\(\{b_{n}\}\)的前\(n\)项和\(S_{n}\)．