The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?

If it's melting point is 115 degrees Celsius, sulfur would have melted at 200 degrees Celsius. However, it won't be anywhere near close to boiling, as it would still need to get over 200 degrees hotter for it to boil.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.