Potassium is placed where it is based on its properties and it's reactivity. It's also placed there based on it's atomic number.
Answer:
b) H2CO3
Explanation:
The conjugate acid of HCO3– is Carbonic acid (H2CO3).
I believe that the answer is A. Decaying
<u>Given:</u>
Enthalpy change (ΔH) for SO3 decomposition = +790 kJ
Moles of SO3 = 2.1 moles
<u>To determine:</u>
Energy required when 2.1 moles of SO3 reacts
<u>Explanation:</u>
The decomposition reaction is -
2SO3(g) → 2S(s) + 3O2 (g)
Energy required when 2 moles of SO3 reacts is 790 kJ
Thus, for 2.1 moles of SO3 the energy requirement would be
= 2.1 moles SO3 * 790 kJ/2 moles SO3 = 829.5 kJ
Ans: 830 kJ are required when 2.1 moles of SO3 reacts.
I'm pretty sure number 48 is C. Hope this helped :)
