PLEASEEE answer correctly! I will give u 10pts and brainleist if u get it right please:) (SCIENCE)

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

Consider the following reaction at equilibrium: c(s)+h2o(g)⇌co(g)+h2(g) predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances. a) c is added to the reaction mixture. b) h2ois condensed and removed from the reaction mixture c) co is added to the reaction mixture d) h2 is removed from the reaction mixture.