A marshmallow has an initial volume of 0.033 L at standard pressure (1.0 atm). If the marshmallow is placed in a vacuum chamber and the final volume is 0.439L, what is the pressure inside the chamber?

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o