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Formula Weight (FW) •A formula weight is the sum of the atomic weights for the atoms in a chemical formula. •So, the formula weight of calcium chloride, CaCl 2, would be Ca: 1(40.1 amu) + Cl: 2(35.5 amu) 111.1 amu •Formula weights are generally reported for ionic compounds.
1 amu = 1.66054 x 10 g 1 Joule = 1 kg x m 1 Cal = 4.184 J 1 GHz = 1,000, 000,000 Hz Formula Types Molecular ... a chemical formula that only shows the reacting substances in the smallest possible whole number ratios Structural Formula a chemical formula that shows all of the molecules and placements Solubility Rules ... Chemistry Basics Cheat ...
Formula Weight (FW)! • Sum of the atomic weights for the atoms in a chemical formula • So, the formula weight of calcium chloride, CaCl 2, would be Ca: 1(40.1 amu) + Cl: 2(35.5 amu) 111.1 amu • These are generally reported for ionic compounds
The atomic mass unit (u or amu) is a relative unit based on a carbon-12 atom with six protons and six neutrons, which is assigned an exact value of 12 amu's (u's). This is the standard unit for atomic or molecular mass, and 1 amu is thus 1/12 th the mass of a 12 C atom. This is obviously very small. 1 amu = 1.66054x10-27 Kg = 1.66054x10-24 g
Formula mass is a number expressed in amu or g/mol units obtained by simply adding up all masses of the atoms that are in the chemical formula. This calculation is based
A molecule of NH 3 contains one N atom weighing 14.01 amu and three H atoms weighing a total of (3 × 1.008 amu) = 3.024 amu. The formula mass of ammonia is therefore (14.01 amu + 3.024 amu) = 17.03 amu, and its percent composition is:
1 mole of those atoms is that the atomic mass of an element expressed in amu is numerically the same as the mass of 1 mole of atoms of the element expressed in grams.
