What is measured in grams?

Can someone me with questions 12 and 13 plz.

How much energy is made when a pice of wood burns. how do you know

Give the set of reactants (including an alkyl halide and a nucleophile) that could be used to synthesize the following ether: draw the molecules on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars, including charges where needed. ch3ch2och2ch2chch3 | ch3