Answer: 21 percent
Explanation:
According to NASA, the gases in Earth's atmosphere include: Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent.
Answer:
the second one
D. Water
the covalent bonds of water are stronger than the ionic bonds in the salt molecules so they dissolve.
Answer:all of them
Number of molecules= 9.34 * 6.022*10^23 = 5.6245*10^24 molecules.
