Ankit Mukherjee

GAM stands for gram atomic mass and GMM stands for gram molecular mass. These are functionally same as the molar mass. GMM is the mass in gram of one mole of a molecular substance.
Masses: GAM, GMM, GFM A. GAM = gram atomic mass 1) the atomic mass (listed on the periodic table) written in grams 1 atom Xe = 131.30 amu & 1 mol Xe = 131.30 g & GAM of Xe = 131.301 g 2) these numbers are usually rounded to 0.1 (tenths) B. GMM = gram molecular mass 1) the sum of all masses of atoms in a molecular compound 1 molecule Cl2 = 70.9 amu & 1 mol Cl2 = 70.9 g & GMM Cl2 = 70.9 g 2) example: E6) Find the GMM of methane, CH4. CH4 = 1(12.0) + 4(1.0) = 12.0 + 4.0 = 16.0 g C. GFM = gram formula mass 1) the mass of one mole of ionic compound 1 f.unit NaCl = 58.4 amu & 1 mol NaCl = 58.4 g & GFM NaCl = 58.4 g 2) example: E7) Find the GFM of calcium hydroxide, Ca(OH)2. Ca(OH)2 = 1(40.1) + 2(16.0) + 2 (1.0) = 74.1 g.