These questions are on gas laws.

If I had 25.0 grams of methane, how many moles of CH4 would I have?

If I had the above moles of methane in a sealed 1.55 Liter container at 25C, what would be the pressure in the container in the atmosphere?

.If I cooled down the same number of moles in the same container to 12C what would be the pressure in the atmosphere?

Did the pressure in the container increase or decrease? Explain why it happened.

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.