Which radioisotopes have the same decay mode and have half-lives greater than
hour?
(1) au-198 and n-16 (3) 1-131 and p-32
(2) ca-37 and fe-53 (4) tc-99 and u-233

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 minerals.