What would the percentage of thorium-232 (parent compound) be in a rock that was dated 1.4 billion years?

93.33%

Explanation:

Thorium is a radioactive element with a molecular weight of 232g/mol. Thorium is very stable and can have 14.05 billion years of half-life period. Every half-life passed, the parent compound mass will be decayed by half. If the age of the rock is 1.4 billion years, then the amount of the parent compound will be:r = ½^(time elapsed/half-life)

r = ½^(1.4bil years/14.05 bil years)

r = ½^(0.0996)= 0.9333

r= 93.33%

The rock will have 93.33% of the parent compound and 6.67% of the decayed compound.

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation: