a scientist working in the middle of a desert found a rock with a fossil of a clam. the scientist knew that clams live in the sea. which could the fossil tell the scientist about the history of the desert​

The fossil could tell the scientist that the dessert was once a sea

It means that that fossil was probably in an ocean or water at the time. So the desert wasn't always a desert. So I agree with the other guy.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa