The rate constant for this second‑order reaction is 0.380 M − 1 ⋅ s − 1 0.380 M−1⋅s−1 at 300 ∘ C. 300 ∘C. A ⟶ products A⟶products How long, in seconds, would it take for the concentration of A A to decrease from 0.860 M 0.860 M to 0.230 M?

8.38 seconds

Explanation:

Integrated rate law for second order kinetics is given by:

= initial concentartion = 0.860 M

a= concentration left after time t = 0.230 M

k = rate constant =

Thus it will take 8.38 seconds for the concentration of  A to decrease from 0.860 M to 0.230 M .

The positive charge in carbon is C

Explanation:

Atomic weight: An atom consists of protons, neutrons and electrons. Atomic mass is the sum of the number of protons and neutrons. The average weight of mass is called atomic mass of that atom.

The positive charge of an atom is proton.

The atomic weight of carbon = 12.0107 g/mol

Avogadro's number = 6.023×10⁻²³ atom/ mol

Charge = 1.602×10⁻¹⁹ C

The weight of carbon = 0.9 kg = 900 gram

Number of protons in carbon = 6

The positive charge in carbon is

=No. mole× Avogadro's Number× No. proton × charge per proton

C