When 20 grams of water is cooled from 20 degrees Celsius to 10 degrees Celsius, the number of calories of heat
released is
(Specific heat of Water = 1 calorie/gram °C OR 4.186
joule/gram °C)

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.

i believe the answer is three water molecules