What is the empirical formula for a compound which contains 32% carbon, 42.66% oxygen, 18.67 nitrogen, 6.67 % hydrogen

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

Particles vibrate in a rigid structure and do not move relative to their neighbors.

What is the empirical formula for c4h8o2