Find the mass of oxygen gas (O2), in grams, required to completely react a 24-gram sample of
methane gas.
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grams oxygen gas

they are both synthetic elements

explanation:

d

i think   the answer is c hope i'm right

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.