Be sure to answer all parts.

What is the $[$H$3$O$+]$ and the pH of a buffer that consists of $0\mathrm{.}33$ M HNO$2$ and $0\mathrm{.}84$ M KNO$2?($Ka of HNO$2=7\mathrm{.}1\backslash$times $104)$

$[$H$3$O$+]=\backslash$times $10$ M$($Enter your answer in scientific notation.$)$

pH $=$