How many grams are in 19.2 x 10^23 molecules of agno3

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

 19.2 x 10^23 molecules of AgNO3 ( 1 mol / 6.022 x 10^23 molecules ) (169.87 g/mol) = 541.60 g AgNO3

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium