Write the positive ion on the left and the negative ion on ...



Formulas of Compounds Polyatomics

How many of each element are present in the following compounds and what is the molar mass of each compound?

Molar Mass

KOH K = 1 O = 1 H = 1 56.11 g

Ca(OH)2 Ca = 1 O = 2 H = 2 74.10 g

Be(ClO4)2 Be = 1 Cl = 2 O = 8 207.912 g

MgSO4 Mg = 1 S = 1 O = 4 120.38 g

H3PO4 H = 3 P = 1 O = 4 97.97 g

(NH4)3P N = 3 H = 12 P = 1 84.97 g

Sr(CN)2 Sr = 1 C = 2 N = 2 139.62 g

FeCO3 Fe = 1 C = 1 O = 3 115.85 g

RbMnO4 Rb = 1 Mn = 1 O = 4 204.41 g

Fe2(CO4)3 Fe = 2 C = 3 O = 12 339.7 g

The positive ion is on the left and the negative ion on the right. Use subscripts to make the compound neutral. Name the compound.

Positive Ion (Cation) Formula Name Negative Ion (Anion)

Potassium K+ K3PO4 Potassium phosphate PO43- phosphate

Lithium Li+ LiNO2 Lithium nitrite NO2- nitrite

Magnesium Mg2+ MgSO4 Magnesium sulfate SO42- sulfate

Hydrogen H+ HCN Hydrogen cyanide CN- cyanide

Silver Ag+ AgHCO3 Silver bicarbonate HCO3- bicarbonate

Calcium Ca2+ CaO Calcium oxide O2- oxide

Strontium Sr2+ Sr(OH)2 Strontium hydroxide OH- hydroxide

Beryllium Be2+ BeCO3 Beryllium carbonate CO32- carbonate

Sodium Na+ Na2SO3 Sodium sulfite SO32- sulfite

Gallium Ga3+ Ga(ClO)3 Gallium hypochlorite ClO- hypochlorite

Potassium K+ KMnO4 Potassium permanganate MnO4- permanganate

Indium In3+ In(NO3)3 Indium nitrate NO3- nitrate

Barium Ba2+ Ba(ClO3)2 Barium chlorate ClO3- chlorate

Aluminum Al3+ AlN Aluminum nitride N3- nitride

Zinc Zn2+ ZnBr2 Zinc bromide Br- bromide

Ammonium NH4+ NH4Cl Ammonium chloride Cl- chloride

Write the formula for the following compounds. This set has only binary compounds.

Name Cation Anion Formula Molar Mass

Potassium chloride K+ Cl- KCl 74.55 g

Calcium sulfide Ca2+ S2- CaS 72.15 g

Aluminum bromide Al3+ Br- AlBr3 266.68 g

Lithium sulfide Li+ Cl- LiCl 42.391 g

Barium iodide Ba2+ I- BaI2 391.1 g

Gallium selenide Ga3+ Se2- Ga2Se3 376.32 g

Write the formula for the following compounds.

Name Cation Anion Formula Molar Mass

Potassium phosphate K+ PO43- K3PO4 212.27 g

Ammonium chloride NH4+ Cl- NH4Cl 53.45 g

Strontium nitrate Sr2+ NO3- Sr(NO3)2 211.62 g

Gallium sulfite Ga3+ SO32- Ga2(SO3)3 379.65 g

Sodium cyanide Na+ CN- NaCN 49 g

Beryllium chlorate Be2+ ClO3- Be(ClO3)2 175.912 g

Lithium carbonate Li+ CO32- Li2CO3 73.882 g

Fill in the following formulas.

| |Hydroxide |Phosphate |Carbonate |Sulfate |Nitrite |Sulfite |

|Ammonium |NH4OH |(NH4)3PO4 |(NH4)2CO3 |(NH4)2SO4 |NH4NO2 |(NH4)2SO3 |

|Aluminum |Al(OH)3 |AlPO4 |Al2(CO3)3 |Al2(SO4)3 |Al(NO2)3 |Al2(SO3)3 |

|Strontium |Sr(OH)2 |Sr3(PO4)2 |SrCO3 |SrSO4 |Sr(NO2)2 |SrSO3 |

|Gallium |Ga(OH)3 |GaPO4 |Ga2(CO3)3 |Ga2(SO4)3 |Ga(NO2)3 |Ga2(SO3)3 |

|Calcium |Ca(OH)2 |Ca3(PO4)2 |CaCO3 |CaSO4 |Ca(NO2)2 |CaSO3 |

|Hydrogen |HOH |H3PO4 |H2CO3 |H2SO4 |HNO2 |H2SO3 |

|Vanadium(III) |V(OH)3 |VPO4 |V2(CO3)3 |V2(SO4)3 |V(NO2)3 |V2(SO3)3 |

|Magnesium |Mg(OH)2 |Mg3(PO4)2 |MgCO3 |MgSO4 |Mg(NO2)2 |MgSO3 |

Fill in the following formulas. Place an X where no formula is possible. (Positive ion combined with a positive or a negative ion combined with a negative ion)

| |Hydroxide |Gallium |Ammonium |Phosphate |Magnesium |Nitrite |

|Hydrogen |HOH |X |X |H3PO4 |X |HNO2 |

|Nitrate |X |Ga(NO3)3 |NH4NO3 |X |Mg(NO3)2 |X |

|Oxide |X |Ga2O3 |(NH4)2O |X |MgO |X |

|Lithium |LiOH |X |X |Li3PO4 |X |LiNO2 |

|Cyanide |X |Ga(CN)3 |NH4CN |X |Mg(CN)2 |X |

|Barium |Ba(OH)2 |X |X |Ba3(PO4)2 |X |Ba |

|Bicarbonate |X |Ga(HCO3)3 |NH4HCO3 |X |Mg(HCO3)2 |X |

|Sulfate |X |Ga(SO4)3 |(NH4)2SO4 |X |MgSO4 |X |

|Aluminum |Al(OH)3 |X |X |AlPO4 |X |Al(NO2)3 |

|Beryllium |Be(OH)2 |X |X |Be3(PO4)2 |X |Be(NO2)2 |

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