How many moles of diphosphorus pentoxide can be made from 1.23 moles of oxygen?

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

Solid tin exists in two forms: white and gray. for the transformation sn(s, white) → sn(s, gray) the enthalpy change is -2.1 kj/mol and the entropy change is -7.4 j/(mol*k). a. calculate the gibbs free energy change for the conversion of 1.00 mol white tin to gray tin at -30℃. b. will white tin convert spontaneously to gray tin at -30℃? c. at what temperature are white and gray tin thermodynamically equivalent at a pressure of 1 atm?

Which part of the mantle is similar to the crust ? (science)