Tamara pours hot tea into a cold mug. a few moments later, she picks up the mug, and it is now warm.

what is the main form of energy transfer involved in heating the mug?

Conduction

Explanation: MODES OF HEAT TRANSFER

Conduction: This type of heat transfer happens when there is direct contact between the two object.

Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas).

Radiation: This type of heat transfer happens when there is direct transfer of energy through space.

Thus as there is direct contact between the mug and the tea, the heat transfer occurs through conduction.

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.