4 moles of hydrogen = 4 * 1.008 = 4.032 grams
1 mole of helium = 4.003 grams
Difference is 4.032 - 4.003
= 0.029 g
1) Ca-37, with a half-life of 181.1(10) ms.
The human gametes differ from all the other cells in the body because the somatic cells have a complete set of chromosomes