Can someone help Find the molar mass for each of the reactants and each product in this equation (ASAP) H+(aq) + HCO3-(aq) →CO2(aq) + H2O(l)

Iknow #2 is d. i just need to know why

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?