Question

6. Определите, какие из предложенных реакций экзотермические, а какие — эндо- термические:а) 4NH + 30, = 2N, + 6H,0 + 153,2 кДж;б) C+0,= CO, + 402 кДжB) CH + 20, = CO, + 2H,0 + 890 кДж;г) 2Hgo = 2Hg + 0, -176,4 кДж?​

Answer 1

Экзотермические реакции идут с выделением тепла (+ Q).

Эндотермические реакции идут с поглощением тепла (- Q).

- - -

а) Экзотермическая (так как +153,2 кДж).

б) Экзотическая (так как + 402 кДж).

в) Экзотермическая (так как + 890 кДж).

г) Эндотермическая (так как - 176,4 кДж).

Answer 2

Exothermic and Endothermic Reactions

Exothermic reactions release energy in the form of heat, while endothermic reactions absorb energy from their surroundings. Let's analyze each of the given reactions to determine whether they are exothermic or endothermic.

a) 4NH3 + 3O2 → 2N2 + 6H2O + 153.2 kJ This reaction releases 153.2 kJ of energy, indicating that it is an exothermic reaction. [[1]]

b) C + O2 → CO2 + 402 kJ This reaction releases 402 kJ of energy, indicating that it is also an exothermic reaction. [[2]]

c) CH4 + 2O2 → CO2 + 2H2O + 890 kJ This reaction releases 890 kJ of energy, indicating that it is an exothermic reaction as well. [[3]]

d) 2HgO → 2Hg + O2 + (-176.4) kJ This reaction involves the absorption of energy, as indicated by the negative value of -176.4 kJ. Therefore, it is an endothermic reaction. [[4]]

To summarize: - Reactions a), b), and c) are exothermic reactions because they release energy. - Reaction d) is an endothermic reaction because it absorbs energy.

I hope this helps! Let me know if you have any further questions.