What mass of zinc nitrate is needed to prepare 2563 mL of a 0.450 M solution? (molar mass = 189.40 g/mol) a 2.18 x 105 grams

b 33.3 grams

c 218 grams

d 6.09 grams

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