Heat of combustion of trichlorosilane

Trichlorosilane: Key parameters of trichlorosilane. Trichlorosilane is also known as trichlorosilane or silicochloroform; its English names are trichlorosilane or silicochloroform, and its molecular formula is SiHCl3. It is used in the synthesis of organosilanes as well as chlorosilanes containing alkyl, aryl, and organic functional groups. It represents the most fundamental monomer among organosilane coupling agents, and it is also a raw material for producing semiconductor silicon and single-crystal silicon. With the development of the industry related to organosilane coupling agents, there has been a growing demand for trichlorosilane, leading to an increasing production volume of this substance. Trichlorosilane is a colorless liquid that is volatile and hygroscopic; it reacts with air to produce white smoke, decomposes when in contact with water, and is soluble in organic solvents such as benzene and ether. It belongs to the category of materials that are highly flammable when exposed to moisture; it is both flammable and explosive, and reacts with water to produce hydrogen chloride gas ； It reacts violently with oxidizers, and can catch fire or explode in the presence of open flames or high temperatures. 【CAS Number】 10025-78-2 【Molecular Formula】 CL3-H-SI 【Molecular Weight】 135.44 【Specific Gravity】 1.35 (0°C) 【Melting Point】 -134 °C 【Boiling Point】 31.8 °C 【Vapor Pressure】 400 mmHg 【Vapor Density】 4.7 【Acute Toxicity】 Oral – Rat LD50: 1030 mg/kg; Inhalation – Mouse LC50: 1500 mg/m³/2 hours 【Toxicity Classification】 Toxic 【Flash Point】 -13.89 °C 【Flammability Hazards】 Flammable in the presence of open flames, high temperatures, or oxidizing agents; produces toxic chloride fumes when exposed to water or high temperatures 【Storage and Transportation】 Store in a well-ventilated, cool, and dry area; keep separate from oxidizing agents and acids 【Extinguishing Agents】 Dry powder, dry sand, carbon dioxide, foam. The physical properties of trichlorosilane are as follows: Specific Gravity: 1.35 ； Relative gas density: 4.7 ； Boiling point: 31.8 ℃ ； Saturated vapor pressure (14.5 °C) 53.33 Kpa ； Flash point: -13.9 °C (open cup) ； Spontaneous ignition temperature: 175 ℃ ； Lower explosion limit: 6.9% ； Maximum explosion level: 70 % ； Solubility: Soluble in organic solvents such as benzene and ether ； It has acute toxicity.

You have to calculate it yourself; there is no literature available on this yet

Why is there a heat of combustion? Estimate using the group value; all that is known is that the reaction enthalpy is -513.05 kJ.mol-1

Hehe, none of the previous responses actually addressed the request for help; only the answer from floor 5 met the original poster’s needs!

How can trichlorosilane have two autoignition temperatures? Some sources indicate 175°C, while others state 104.4°C? Could someone expert please advise on how to calculate it?

To do this, it’s sufficient to know the enthalpy value; I think there’s some information available from a company called Bai’s Chemistry