Which example is not a biomass energy source?

Nonmetal halogen family atmoic mass 35

What is the mass of 0.46 mil of mgcl2

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?