How many moles of magnesium phosphate, Mg3 (PO3 )2 will contain 0.25 m

1.	How many moles of magnesium phosphate, Mg3 (PO3 )2 will contain 0.25 mole of oxygen atoms?(a) 1.25 x 10-2(b) 2.5 x 10-2(c) 0.02(d) 3.125 x 10-2
Answer» Correct option is : (d) Strategy : using the mole concept equate the moles of Mg₃ (PO₄ )₂ to the number of atoms of oxygen in the formula of the compound. Solution : 1 mole of Mg₃ (PO₄ )₂ contains 8 moles of oxygen atoms. Therefore 0.25 moles of oxygen atoms are present in 1/8 x 0.25 moles of Mg₃ (PO₄ )₂ = 3.125 x 10^-2 moles of Mg₃ (PO₄ )₂

How many moles of magnesium phosphate, Mg3 (PO3 )2 will contain 0.25 mole of oxygen atoms?(a) 1.25 x 10-2(b) 2.5 x 10-2(c) 0.02(d) 3.125 x 10-2

Answer»

Correct option is : (d)

Strategy : using the mole concept equate the moles of Mg₃ (PO₄ )₂ to the number of atoms of oxygen in the formula of the compound.

Solution : 1 mole of Mg₃ (PO₄ )₂ contains 8 moles of oxygen atoms.

Therefore 0.25 moles of oxygen atoms are present in 1/8 x 0.25 moles of Mg₃ (PO₄ )₂ = 3.125 x 10^-2 moles of Mg₃ (PO₄ )₂