How to calculate Δng?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Δng (change in number of moles of gas) is calculated by subtracting the total moles of gaseous reactants from gaseous products: Δng = Σn(products) - Σn(reactants). Count only gaseous species, ignoring solids and liuids. For example, in N₂ + 3H₂ → 2NH₃, Δng = 2 - (1+3) = -2 moles. This value is important in calculating work and enthalpy relationships.
Suggested Q&A
General · Class 12- GeneralClass 12Electric Field at Centre of Ring with Non-Uniform Charge Distribution. Four quadrants carry linear charge densities: +2λ, −2λ, +λ, −λ. Find electric field at centre.
- GeneralClass 12P°(hexane) = 408 Torr, P°(heptane) = 141 Torr. x(hexane) = 0.300. Find Y₆ and Y₇.
- GeneralClass 122N₂O₅(g) → 4NO₂(g) + O₂(g). Initial P = 50 mmHg; P at 30 min = 87.5 mmHg. Find P at 60 min.
- GeneralClass 12What is the difference between psychosis and neurosis?
- GeneralClass 12What is the difference between prism and a pyramid?
- GeneralClass 12What is the difference between phrase and clause?