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Eyonix
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Post Posted: 18-11-2010, 09:06:55 | Translate post to: ... (Click for more languages)

Help la problema asta
O lumanara a ars complet sub un clopot in care se gasesc 0.8g O,gazul rezultat fiind dioxidul de carbon.Sa se afle procentul de carbon din lumanare ,daca la inceputal arderii cantarea 5g.{R:6% C}

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Malpraxxiss

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Post Posted: 18-11-2010, 11:19:28 | Translate post to: ... (Click for more languages)

Teribil de dificila.

Ecuatia reactiei chimice: C + O2 -> CO2

M C = 12g/mol (unde M=masa moleculara)
M O2 = 32g/mol
m O2 = 0,8g

Facand calculul pe reactie voi obtine masa de carbon din lumanare, m C = 0,3g

Aplicand regula de 3 simpla vei obtine procentul de C din lumanare, 6%, cum ai stipulat si tu mai sus.

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