4
a piece of potato of initial mass 25 g was placed in water. after 15 minutes its final mass was 50 g.
calculate the percentage gain in mass of the potato.

the correct answer is a

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.

2b2t

explanation:

2b2t