Question

question 4 (1 point)
how many equivalents of mg⁺² are there in 6.00 mol of mg₃(po₄)₂ ?
first we have to convert moles into equivalents
mg₃(po₄)₂ → 3 mg⁺² + 2 po₄⁻³
1 mol = 1 equivalents
2 eq
(6.00 mol mp)(---------) = 3 eq mg⁺²
4 mol
a. 250. b. 100.0 c. 2 d. 30.00 e. 6 f. 33 g. 3 h. 36

i. 18.0 j. 1 k. 6.00 x 10⁻³ l. 3.60 x 10⁻² m. 6.00 x 10⁻² n. 5

o. 3.0 x 10⁻² p. 1.80 x 10⁻² q. 7.65 x 10⁻¹⁰ r. 2.63 s. 7.89

t. 5.26 u. 10¹² v. 10⁹ w. 10⁶ x. 10³ y. 95.21 z. 10

Explanation:

Step1: Determine equivalents per mole of \(Mg^{2+}\)

For \(Mg^{2+}\), the charge is \(+ 2\). So, \(1\) mole of \(Mg^{2+}\) has \(2\) equivalents.

Step2: Find moles of \(Mg^{2+}\) from \(Mg_3(PO_4)_2\)

From the dissociation \(Mg_3(PO_4)_2
ightarrow3Mg^{2 +}+2PO_4^{3-}\), \(1\) mole of \(Mg_3(PO_4)_2\) gives \(3\) moles of \(Mg^{2+}\).

Step3: Calculate equivalents of \(Mg^{2+}\)

We have \(6.00\) mol of \(Mg_3(PO_4)_2\). Moles of \(Mg^{2+}=6.00\times3 = 18.0\) mol.
Equivalents of \(Mg^{2+}=18.0\times2\) (since \(1\) mol \(Mg^{2+}=2\) eq)

$$6.00\times3\times2=36$$

Answer:

1. G. \(3\)
2. C. \(2\)
3. H. \(36\)
4. J. \(1\)