Billy expands when his fuel starts to run out. He isn't as hot on the surface anymore, which makes him red, and he is many times larger
than he used to be. He is now called a red giant.
What does Billy do now? (Billy has 1 stellar mass.)
expands even more
contracts to form a white dwarf
has a supernova

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.

the answer is d. 74.02

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.