write a balanced equation and a approximate enthalpy diagram for the combustion of methane in oxygen​

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

A650 ml sodium bromine solution has a bromide ion concentration of 0.245 m. what is the mass (g) of sodium bromide in solution? a) 103.b)0.00155.c)16400.d) 16.4.e) 0.159

How does climate change cause the ocean's thermohaline current to slow down?