Consider the following intermediate chemical equations.
pe(s)+6012(g) →
4pci,(g) → p4(s)+10c12(0)
ah, --2,439 kj
ah2 = 3,438 kj
what is the enthalpy of the overall chemical reaction pcl.(g) → pci; (g) + cl2(g)?
-999 kj
-250. kj
250. kj
999 kj

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

Why do lunar and solar eclipse not happen every month