Find actual atomic mass of helium

Answer 1

atomic mass of helium is

4.0026 amu

each amu = about 1.66 x 10^-24 grams

4.0026 amu = 4.0026(1.66 x 10^-24) = 6.644316 x 10^-24 grams

that's for the helium isotope with 2 neutrons