If an unknown compound contains 56.77% nitrogen and 43.23% oxygen, what is the empirical formula for this unknown compound?

Which of the following is a compound? a.carbon b.oxygen c.hydrogen d.water

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

What is the molarity of 60.0 grams of naoh dissolved in 750 milliliters of water? a) 1.1 m b) 2.0 m c) 12 m d) 75 m