22. Hydrogen peroxide is a liquid at room temperature with a boiling point of 150°C, whereas ethyne is a gas at room temperature with a boiling point of -84°C. Draw the molecules. Based on intermolecular forces, explain this difference in physical properties of these compounds that have similar chemical formulas and molar masses.

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.