Specific heat is used to explain why different substances
a) sink or float
b) change temp. at different rates
c) vaporize or condense at different temp.’s
d) melt and freeze at the same temp.

change temperature at different rates

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.