if 400 grams of ethane (C2H6) goes through complete combustion how many grams of oxygen would be needed

Each pair of clay balls represents to planetesimals if each plane test molluscum pound of the same material and is separated by the same distance which pair experiences the greatest gravitational attraction

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

What type of electromagnetic waves does the human eye see as the colors red blue or green a visible light waves b radio waves c infrared waves d microwaves