What can scientist might learn about the seawater that exited millions of years ago by studying rocks the cake into contact with the seawater at the time in the past?

The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

What does a numerical subscript following an element in a chemical formula mean?