When 2.50 g of methane burns in oxygen, 125 kJ of heat is produced. The molar mass of CH4 is 16.04 g/mol. What is the enthalpy of combustion per mole of methane under these conditions?

Sorry i dont understand the question can you rephase it?

D. h2o + h2o > h3o + oh- confirmed.

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.