There are 11.5 moles of potassium contained in 449 g fundamental units of potassium. therefore,
option B is correct.
A mole is the mass of a substance made up of the same number of fundamental components. Atoms in a 12-gram example are identical to 12C. Depending on the substance, the fundamental units may be molecules, atoms, or formula units.
Atomic weight 39.1 is assigned to potassium (chemical symbol K).
K content in a 449g sample is equal to
=given weight / atomic weight
=449/39.1
= 11.5mol.
A 449g sample has 11.5 moles of potassium.
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