Answer:
B
Explanation:
carbon 12 is most useful to humans
To assign a priority to an atom that is part of multiple bonds, treat the multiple bonds as an equivalent number of single bonds. Hence, option A is correct.
<h3>What is a stereogenic centre?</h3>
A carbon atom is a chiral (stereogenic) centre if it is tetrahedral (sp3) and has four different groups (ligands) attached to it.
To assign a priority to an atom that is part of multiple bonds, treat the multiply bonded atom as an equivalent number of singly bonded atoms.
If two isotopes are bonded to the stereogenic centre, the isotope with the higher mass number has a higher priority.
Hence, option A is correct.
Learn more about the stereogenic centre here:
brainly.com/question/12995502
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Answer:
8 moles of CO
Explanation:
To produce carbon monoxide we begin from C and O₂ as this reaction shows:
2C + O₂ → 2CO
Therefore, 2 moles of C can produce 2 moles of CO
If I have 8 moles of C, I must produce 8 moles of CO
Ratio is 1:1
Answer: 47.276 kJ/mol
Explanation:
According to Gibb's equation:
= Gibbs free energy
= enthalpy change
= entropy change = +106 J/mol
T = temperature in Kelvin = 446 K
= +ve, reaction is non spontaneous
= -ve, reaction is spontaneous
= 0, reaction is in equilibrium
(1kJ=1000J)
Thus the value of ΔH = 47.276 kJ/mol, assuming that ΔH and ΔS do not vary with temperature.
Phosphoric acid has 3 pKa values (pKa1=2.1, pKa2=6.9, pKa3= 12.4) and after 3 ionization it gives 3 types of ions at different pKa values:
H₃PO₄(aq) + H₂O(l) ⇌ H₃O⁺(aq) + H₂PO₄⁻ (aq) pKₐ₁
<span>
</span>H₂PO₄⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HPO₄²⁻ (aq) pKₐ₂
HPO₄²⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + PO₄³⁻ (aq) pKₐ₃
The last equilibrium is associated with the highest pKa value (12.4) of phosphoric acid. There the last OH group will lose its hydrogen and hydrogen phosphate ion (HPO₄²⁻) turns into phosphate ion (PO₄³⁻).
