Areaction a(aq) + b(aq) > c(aq) has a standard free‑energy change of − 3.87 kj / mol at 25 °c.
1. what are the concentrations of a , b , and c at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 m, 0.40 m, and 0 m, respectively?

The concentration of A, B and C is 0.14 M, 0.24 M and 0.16 M respectively.

Explanation:

Relation between standard Gibbs free energy and equilibrium constant follows:

where,

= standard Gibbs free energy = -3.87 kJ/mol = -3870 J/mol  (Conversion factor: 1 kJ = 1000 J)

R = Gas constant =

T = temperature =

= equilibrium constant in terms of concentration

Putting values in above equation, we get:

The given chemical reaction follows:

Initial:           0.30     0.40          0

At eqllm:     0.30-x   0.40-x        x

The expression of for above equation follows:

We are given:

Putting values in above expression, we get:

Neglecting the value of x = 0.75 because the equilibrium concentration cannot be greater than initial concentration.

So, concentration of A = (0.30 - x) = (0.30 - 0.16) = 0.14 M

Concentration of B = (0.40 - x) = (0.40 - 0.16) = 0.24 M

Concentration of C = x = 0.16 M

Hence, the concentration of A, B and C is 0.14 M, 0.24 M and 0.16 M respectively.

answer: h+ its less than oh

explanation:

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.