A balloon is filled with helium that occupies a volume of 5.0L at 0.995 atm and 32°C. After it is released, it rises to a location where the pressure is 0.720 atm and the temperature is -12°C. What is the volume of the balloon at that new location in liters?

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.