What are the main elements that compose organic fuels? I - The main elements that compose organic fuels are carbon, hydrogen, oxygen, nitrogen, an...
What are the main elements that compose organic fuels?
I - The main elements that compose organic fuels are carbon, hydrogen, oxygen, nitrogen, and sulfur.
II - The quality of the fuel is given by the elements carbon and hydrogen.
III - The presence of oxygen and nitrogen in organic fuels is desirable for industrial combustion.
IV - Combustible materials must have technical and economic requirements such as ease of use, no formation of toxic or corrosive substances during combustion, easy obtainment, low production cost, and safety in storage and transportation.
a) Only I and II are correct.
b) Only II and IV are correct.
c) Only I, II, and IV are correct.
d) Only III and IV are correct.
e) All statements are correct.
I - The main elements that compose organic fuels are carbon, hydrogen, oxygen, nitrogen, and sulfur.
II - The quality of the fuel is given by the elements carbon and hydrogen.
III - The presence of oxygen and nitrogen in organic fuels is desirable for industrial combustion.
IV - Combustible materials must have technical and economic requirements such as ease of use, no formation of toxic or corrosive substances during combustion, easy obtainment, low production cost, and safety in storage and transportation.
a) Only I and II are correct.
b) Only II and IV are correct.
c) Only I, II, and IV are correct.
d) Only III and IV are correct.
e) All statements are correct.
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Ed 
A alternativa correta é a letra c) Apenas I, II e IV estão corretas. Os principais elementos que compõem os combustíveis orgânicos são carbono, hidrogênio, oxigênio, nitrogênio e enxofre. A qualidade do combustível é determinada pelos elementos carbono e hidrogênio. A presença de oxigênio e nitrogênio nos combustíveis orgânicos é desejável para a combustão industrial. Materiais combustíveis devem atender a requisitos técnicos e econômicos, como facilidade de uso, ausência de formação de substâncias tóxicas ou corrosivas durante a combustão, facilidade de obtenção, baixo custo de produção e segurança no armazenamento e transporte.
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