Question

formula mass with an example .​

Answer 1

Answer:

The formula mass of a molecule (also known as formula weight) is the sum of the atomic weights of the atoms in the empirical formula of the compound. Formula weight is given in atomic mass units (amu).

Explanation:

the gram formula mass of 1 moles of KAl(SO4)2 · 12H2O.

Remember, multiply the values of atomic mass units of atoms times their subscripts. Coefficients are multiplied by everything that follows. For this example, that means there are 2 sulfate anions based on the subscript and there are 12 water molecules based on the coefficient.

1 K = 39

1 Al = 27

2(SO4) = 2(32 + [16 x 4]) = 192

12 H2O = 12(2 + 16) = 216

So, the gram formula mass is 474 g.

Answer 2

Answer:

As an example, consider sodium chloride, NaCl, the chemical name for common table salt. Sodium chloride is an ionic compound composed of sodium cations, Na+, and chloride anions, Cl−, combined in a 1:1 ratio. The formula mass for this compound is computed as 58.44

Explanation:

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