Calcium oxide, or lime, is produced by the thermal decomposition
of limestone in the reaction CaCO3(s)_1 , CaO(s) + CO2(g). What
mass of lime can be produced from 859.6 kg of limestone?

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

catya your not at all which answer i've seen you do this on another question!