The mass density of water vapour at 327.6 atm and 776.4 k is 133.2 kg m−3 . given that for water tc = 647.4 k, pc = 21.3 atm, and a = 5.464 dm6 atm mol−2 , b = 0.03049 dm3mol−1 , and m = 18.02 g mol−1 , calculate (a) the molar volume. then calculate the compression from the given data and from the the virial expansion of the van der waals equation

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.