Calculate the enthalpy change at 25oC for the reaction of sodium iodide and chlorine using the info provided. NaI(s) + Cl2(g) -> NaCl(s) + I2(l)
Delta S = -79.9 J/mol. K Delta G = -98.0 kJ/mol. K

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.