It is a dense, colorless, volatile liquid. It is a derivative of methane where one hydrogen is replaced by iodine. It is naturally emitted by rice plantations. It is used in organic synthesis as a source of methyl groups. It is also known as iodomethane.

**CAS no: **74-88-4

## Properties

#### Generic Properties

Property | Value | Unit |
---|---|---|

Chemical Formula | CH3I | - |

Molecular Weight | 141.939 | - |

Heat of Combustion | 5012.4 | kJ/kg |

Boiling Point | 315.58 | K |

Freezing Point | 206.7 | K |

#### Critical Properties

Property | Value | Unit |
---|---|---|

Critical Temperature | 528 | K |

Critical Pressure | 73.7 | bar |

Critical Volume | 185 | cm3/mol |

Critical Density | 0.7672 | g/cm3 |

Critical Z | 0.311 | - |

Accentric Factor | 0.193 | - |

### Temperature Dependent Properties

#### Specific Heat

The specific heat at constant pressure can be calculated with the formula:

Constant | Gas | Liquid |
---|---|---|

A | 25.635 | 24.062 |

B | 0.066836 | 0.46459 |

C | 0.000012292 | -0.0014583 |

D | -3.674E-08 | 1.8792E-06 |

E | 1.2301E-11 | - |

T min(K) | 100 | 208 |

T max(K) | 1500 | 475 |

#### Heat of Formation

The heat of formation can be calculated with the formula:

Constant | Value |
---|---|

A | -9.7243 |

B | -0.030684 |

C | 0.000013517 |

T min(K) | 458.39 |

T max (K) | 1000 |

#### Viscosity

The viscosity can be calculated with the formula:

For liquid

For Gas

Constant | Gas | Liquid |
---|---|---|

A | -16.577 | -9.3737 |

B | 0.5593 | 1126.2 |

C | -0.000098393 | 0.0255 |

D | - | -0.000026102 |

T min(K) | 250 | 250 |

T max(K) | 1000 | 528 |

#### Heat of Vaporization

The heat of vaporization can be calculated with the formula:

Constant | Value |
---|---|

A | 35.967 |

n | 0.302 |

T min(K) | 206.7 |

T max(K) | 528 |

#### Thermal Conductivity

The thermal conductivity can be calculated with the formula:

Constant | Gas | Liquid |
---|---|---|

A | -0.00774 | 0.138 |

B | 0.000043432 | -0.00008924 |

C | 4.642E-10 | -2.314E-07 |

T min(K) | 220 | 236.7 |

T max(K) | 1500 | 458 |

#### Liquid Density

The Liquid Density can be calculated with the Equation:

Constant | Value |
---|---|

A | 0.7672 |

B | 0.2585 |

n | 0.2679 |

T min(K) | 206.7 |

T max(K) | 528 |

#### Diffusion Coefficient at Infinite Dilution in Water

The Diffusion Coefficient at Infinite Dilution in Water can be calculation:

Constant | Value |
---|---|

A | -1.3866 |

B | -1044.8 |

T Min(K) | 274 |

T Max(K) | 394 |

#### Diffusion Coefficient in Air

The Diffusion Coefficient in Air can be calculated with the Equation:

Constant | Value |
---|---|

A | -0.05439 |

B | 0.00032038 |

C | 6.5224E-07 |

T min(K) | 200 |

T max(K) | 1000 |