A is the amount of atoms in exactly 4 grams of Helium. Select one:
a. formula mass
b. atomic mass unit
c. mole
d. kilogram

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

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?