3. sulfur dioxide (so2) can be reduced by hydrogen disulfide (h2s), producing sulfur in its elemental form and water (h2o). using hess’s law and the reactions below, determine the overall enthalpy for the reaction between so2 and h2s. make to clearly show your work.
h2 (g) + s (s) → h2s (g) δh = –20.6 kj
so2 (g) → s (s) + o2 (g) δh = +296.8 kj
2h2 (g) + o2 (g) → 2h2o (g) δh = –285.8 kj

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids

Amixture with the same composition throughout is!

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.