13) ammonium nitrate
14) sodium phosphate
15) lithium hydroxide
write the names of the following ionic compounds:
16) k₂(so₄)
17) mn(no₃)₂
18) na₃(po₄)
19) sr(cr₂o₇)
20) na₂(co₃)
21) sr(mno₄)₂
22) fe₃(po₄)₂
23) al₂(cr₂o₇)₃
24) fe₂o₃
25) cr₃(po₄)₂
26) cao
27) na(c₂h₃o₂)
28) k(clo)
29) mg(clo₂)₂
30) na₂(so₃)

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# Brief Explanations:
For naming ionic compounds, we first identify the cation (positive ion) and the anion (negative ion). For example, in $K_2(SO_4)$, $K^+$ is the potassium cation and $SO_4^{2 -}$ is the sulfate anion. For transition metals like $Mn$ in $Mn(NO_3)_2$, we need to determine the oxidation state. The nitrate ion $NO_3^-$ has a charge of - 1. Let the oxidation state of $Mn$ be $x$. Using the formula $x+2\times(-1) = 0$ (since the compound is neutral), we get $x = + 2$, so it is manganese (II) nitrate. For $Na_3(PO_4)$, $Na^+$ is sodium and $PO_4^{3 -}$ is phosphate. For $Sr(Cr_2O_7)$, $Sr^{2+}$ is strontium and $Cr_2O_7^{2 -}$ is dichromate. For $Na_2(CO_3)$, $Na^+$ is sodium and $CO_3^{2 -}$ is carbonate. For $Sr(MnO_4)_2$, $Sr^{2+}$ is strontium and $MnO_4^-$ is permanganate. For $Fe_3(PO_4)_2$, let the oxidation state of $Fe$ be $x$. Using $3x+2\times(-3)=0$ (since $PO_4^{3 -}$ has a charge of - 3 and the compound is neutral), we get $x = + 2$, so it is iron (II) phosphate. For $Al_2(Cr_2O_7)_3$, $Al^{3+}$ is aluminum and $Cr_2O_7^{2 -}$ is dichromate. For $Fe_2O_3$, let the oxidation state of $Fe$ be $x$. Using $2x+3\times(-2)=0$ (since $O^{2 -}$ has a charge of - 2 and the compound is neutral), we get $x = + 3$, so it is iron (III) oxide. For $Cr_3(PO_4)_2$, let the oxidation state of $Cr$ be $x$. Using $3x+2\times(-3)=0$, we get $x = + 2$, so it is chromium (II) phosphate. For $CaO$, $Ca^{2+}$ is calcium and $O^{2 -}$ is oxide. For $Na(C_2H_3O_2)$, $Na^+$ is sodium and $C_2H_3O_2^-$ is acetate. For $K(ClO)$, $K^+$ is potassium and $ClO^-$ is hypochlorite. For $Mg(ClO_2)_2$, $Mg^{2+}$ is magnesium and $ClO_2^-$ is chlorite. For $Na_2(SO_3)$, $Na^+$ is sodium and $SO_3^{2 -}$ is sulfite.
# Answer:
16) Potassium sulfate
17) Manganese (II) nitrate
18) Sodium phosphate
19) Strontium dichromate
20) Sodium carbonate
21) Strontium permanganate
22) Iron (II) phosphate
23) Aluminum dichromate
24) Iron (III) oxide
25) Chromium (II) phosphate
26) Calcium oxide
27) Sodium acetate
28) Potassium hypochlorite
29) Magnesium chlorite
30) Sodium sulfite

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