8. What is the percent by mass of carbon in CO2? (C. Sc, C.2G) F. 12%
G. 27%
H. 44%
J. 73%

Who is better, messi or cristiano, i need this for a chemistry class. asap

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases.as altitude increases, air density increases.air pressure and density are lowest at sea level.denser air exerts more pressure than less dense air.

What happens to isotopes that are unstable?