PLS HELP The atomic mass of hydrogen is approximately 1.0079 amu. The atomic mass of an oxygen atom is approximately 15.9994 amu. What is the molecular mass of water?

1) 18.02 amu
2) 36.02 amu
3) 34.02 amu
4) 17.02 amu

you need to give more information

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.