A 39.6 mL aliquot of a 44.0 wt% aqueous KOH solution is diluted to 1.30 L to produce a 0.344 M KOH solution. Calculate the density of the 44.0 wt% KOH solution.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

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.