How exactly would it then be calculated? Here's what I have tried:
proton mass: 1.007276 amu
Neutron mass: 1.008665 amu
Sulphur-34 mass: 33.9678668 amu
Calculation:
1.##(16\cdot1.007276)+(18\cdot1.008665)+(16 \cdot0.000549)=34.28117##
2.##34.28117-33.9678668=0.3133032##
3. 1 atomic mass...