I am so lost
How much heat is needed to form 40.0L of NO2 from it's elements at STP?

58.2 kJ
59.8
29.1
119.6

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp