In which of the following equilibrium systems will an increase in the volume cause the equilibrium to shift away from the reactants and towards the products?

- H2(g) + F2(g) ⇌ 2HF(g)
- N2(g) + 3H2(g) ⇌ 2NH3(g)
- CaCO3(g) ⇌ CaO(s) + CO2(g)
- 2NOBr(g) ⇌ 2NO(g) + Br2(g)

2NOBr(g) ⇌ 2NO(g) + Br2(g)

Explanation: For volume changes in equillibrium, the following are to be taken into consideration:

2NOBr(g) ⇌ 2NO(g) + Br2(g) is the equillibrium system because there are more moles of products,therefore an increase in the volume of the reaction will shift to the right and produce more moles of products. Also both reactants and products exist in the gaseous state and does not have equal number of moles.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

c. is the answer

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