Mass of one 147N atom is:
5.0 g of a certain element X forms 10.0g of its oxide having the formula X4O6. The atomic mass of X is ?
What is the relative molecular mass of CuSO4.5H2O? Given the mass of Cu=63.5 amu
An element, X has the following isotopic composition; 200X:90%;199X:8.0%;202X:2.0%. The weighted average atomic mass of the naturally occurring element X is closest to :