Calcium reacts with sulfur forming calcium sulfide. what is the theoretical yield (g) of cas(s) that could be prepared from 1.6 g of ca(s) and 4.25 g of sulfur(s)? enter your answer with two decimal places. do not type units with your answer.

The balanced equation for the above reaction is;
Ca + S ---> CaS
stoichiometry of Ca to S is 1:1
Number of Ca moles - 1.6 g/ 40 g/mol = 0.04 mol
Number of S moles  - 4.25 g / 32 g/mol = 0.13 mol
since Ca to S molar ratio is 1:1, there's excess amount of S present. 
Ca is the limiting reactant.
stoichiometry of Ca to CaS is 1:1
Number of CaS moles to be formed - 0.04 mol
Therefore mass of CaS - 0.04 mol x 72 g/mol = 2.88 g
therefore theoretical yield is 2.88

Sun is explosive itself spread 9 planets.earth is 3rd explosive in the solar system about 500 hundred million years ago . first earth became ice age and freezing climate.centre of earth magma. north zone is artic . south is anatric

Answer:

a. energy is absorbed in the reaction.

explanation:

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.