Agas cylinder contains exactly 15 moles of
oxygen gas (O2) How many molecules of oxygen
are in the cylinder?

What does x represent in the formula for the compound xcl4?

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

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