How many formula units are in 210.55 g of Al2(CO3)3

              5.42 × 10²³ Formula Units

Explanation:

First calculate moles.

Moles = Mass / M.Mass

Moles = 210.55 g / 233.99 g/mol

Moles = 0.8998 moles

Then calculate number of formula units

No. of Formula units = Moles × 6.022 × 10²³ Formula Units

No. of Formula units = 0.8998 mol × 6.022 × 10²³ Formula Units/mol

No. of Formula units = 5.42 × 10²³ Formula Units

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.