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Thus, Na can represent a single sodium atom. It is unusual to find such isolated atoms in nature, with the exception of the noble gases (He, Ne, Ar, Kr, Xe, and Rn). A subscript following the symbol of an element indicates the number of atoms in a molecule. For instance, F2 indicates a molecule containing two fluorine atoms, and P4 a molecule containing four phosphorus atoms. Some elements exist in more than one form. Familiar examples include (1) oxygen, found as O2 molecules, and ozone, found as O3 molecules, and (2) two crystalline forms of carbon — diamond and graphite (Figure 13-33).

41. 44 g when filled with water. 0000 g/cm3. (a) Calculate the volume of the container. 42 g. Calculate the density of the unknown liquid. *42. 664 g. 646 g. 0000 g/cm3 for water. 308 g. Calculate the mass of the metal. 442 g. What mass of water was added? (d) What volume of water was added? (e) What is the volume of the piece of metal? (f ) Calculate the density of the metal. *43. 0% acetic acid (the characteristic component in vinegar) by mass. 049 g/mL at 20°C. 0 mL of this solution at 20°C.

As it expands, its movement up into the evacuated column can be seen. Anders Celsius (1701–1744), a Swedish astronomer, developed the Celsius temperature scale, formerly called the centigrade temperature scale. When we place a Celsius thermometer in a beaker of crushed ice and water, the mercury level stands at exactly 0°C, the lower reference point. In a beaker of water boiling at one atmosphere pressure, the mercury level stands at exactly 100°C, the higher reference point. There are 100 equal steps between these two mercury levels.

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