A sample of magnesium phosphate contains 0.25 moles of oxygen atomsthen find how many moles of magnesium phosphate Mg3(PO4)2 are present in the sample.

Question

A sample of magnesium phosphate contains 0.25 moles of oxygen atomsthen find how many moles of magnesium phosphate Mg3(PO4)2 are present in the sample. (A) 0 text. 2 × 1 0- 2 (B) 1 text. 2 5 × 1 0- 2 (C) 2 text. 5 × 1 0- 2 (D) 3 text. 1 2 5 × 1 0- 2

Tardigrade Admin · Accepted Answer

Mg3 (PO4 )2 One mole of salt has 8 moles of O atoms i.e., 8 moles of O atoms ≡ 1 mole salt 0.25 moles of O atoms ≡ (1/8) × 0 text. 2 5 = (2 5 × 1 0- 2/8) = 3 text. 1 2 5 × 1 0- 2 moles.

Q. A sample of magnesium phosphate contains 0.25 moles of oxygen atomsthen find how many moles of magnesium phosphate Mg₃(PO₄)₂ are present in the sample.

$0.2 \times 1 0^{- 2}$

$1.25 \times 1 0^{- 2}$

$2.5 \times 1 0^{- 2}$

$3.125 \times 1 0^{- 2}$

Mg₃ (PO₄ )₂ One mole of salt has 8 moles of O atoms i.e., 8 moles of O atoms $\equiv$ 1 mole salt
0.25 moles of O atoms $\equiv$ $\frac{1}{8} \times 0.25$
= $\frac{25 \times 1 0 ^{- 2}}{8}$
= $3.125 \times 1 0^{- 2}$ moles.

Q. A sample of magnesium phosphate contains 0.25 moles of oxygen atomsthen find how many moles of magnesium phosphate Mg3(PO4)2 are present in the sample.

0.2×10−2

1.25×10−2

2.5×10−2

3.125×10−2