LP gas (liquid propane, C3H8) is the fuel used in gas grills as well as a main source of
heat energy for many rural residences. What
is the mass of 5.83 x 1017 molecules of liquid
propane?

you need to give more information

the answer is 0.42 is that is an option. this question provides no info

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.