Consider the reaction: 2N2O(g) ⇌ O2(g) + 2N2(g). Which of the following will cause a shift in the equilibrium to the left? 1. Remove N2O
2. Remove O2
3. Add N2

B. nuclear reactions could first occur.

27. =3,500,000 x 4,000 = 14,000,000,000

Qand k are only the same when the forward rate of the reaction has reached zero.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.