What information does the percent composition of an atom in a molecule give?

A. The relative number of atoms one element contributes to a
molecule

B. The relative amount of mass an atom contributes to a molecule

C. The total number of atoms of that element in a molecule

D. The total mass that element contributes to a molecule

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon