Question

124 amu of P4 will contain : (At. mass of P = 31)
(A) 4NA atoms of phosphorus (B) 4 atoms of phosphorus
(C) 1 molecule of phosphorus (D) NA molecules of phosphorus

Answer 1

124 amu of P4 will contain 4NA Atoms of Phosphorus and NA Molecules of Phosphorus.

What is Phosphorous?

• Phosphorous is a mineral and an important element of the periodic table.
• In mineral form, it is found in human bones.
• Phosphorous is an essential element for building strong and healthy bones along with calcium and potassium.
• It has an atomic mass of 3 amu.
• So, the accumulative mass of four atoms of phosphorous will be 124 amu.
• The molecular mass of P4  is equal to  4 × 31 = 124amu.
• Now 124 amu of P4 = 1 mole of P4
• so, it will contain NA molecules of Phosphorus = 4NA

Options A and D are correct.

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Atomic mass, Atomic radius, Atomic number. ​

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