Which statement accurately describes the relationship between air pressure, air density, or altitude? A. As altitude increases, pressure increases.

B. As altitude increases, air density increases.

C. Air pressure and density are lowest at sea level.

D. Denser air exerts more pressure than less dense air.

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?