Calculate the overall change in enthalpy that occurs when 20.00 grams of PHz (9) reacts with 20.0 grams of 0, (g) according to the equation below. [Be sure to include the correct
sign on your answer]
4 PH3 (9) + 8 02 (g) → P,010 (s) + 6 H20 (1)
Enthalpy Change:
k]

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

Modern weaponry has increased the number of deaths in wars and violent conflicts.

Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2: