Can someone help me finish please.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Will mark brainliest how many electrons can be held in the energy level n = 4?

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.