Homework Help: Chemistry - please help!

Posted by Anonymous on Sunday, April 20, 2008 at 11:14am.

1)Ethanol is made by the fermentation of sugar.
(a)Suggest a temperature for carrying out the fermentation and explain your answer. -40°C(ish), ??to do with enzymes; they can't or don't work as well in other temps./controls the speed of fermentation
(b)Why is it important that air does not enter the flask? -

2)Methanol burns in oxygen to make carbon dioxide and water. The equation is exothermic, with 1452kJ/mol. of energy being released.
(a)Write a balanced equation for the combustion of methanol.
-methanol+oxygen=carbon dioxide+water
-CH3OH+O2=CO2+H2O
?(b)State how much energy (in kJ) us released when 1 mole of methanol is burned.
?(c)Calculate the amount of heat energy released on burning 4 moles of methanol.
(d)What is the molar mass of methanol?(=32) Use the value to calculate the energy release when 4g of methanol is burned. (use n=m/Mr ?)
(e)Calculate the mass of carbon dioxide produced when 16g of methanol is used. (use n=m/Mr ?)

Chemistry - please help! - Anonymous, Sunday, April 20, 2008 at 3:04pm
Fermentation is usually carried out at around 70 degrees F. The lower the temperature, the slower the process. Fermentation is an anaerobic process. If air/oxygen enters the flask then bacteria may grow and spoil the fermentation process.

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