Achemistry student needs 75.0ml of pentane for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of pentane is 0.626·gcm−3 . calculate the mass of pentane the student should weigh out.

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Arecipe calls for 1.2 cups of oil. how many liters of oil is this?

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.