Yeast convert glucose to ethanol and carbon dioxide during anaerobic fermentation as depicted in the simple chemical equation here:
glucose ? ethanol + carbon dioxide
(a) if 200.0 g of glucose is fully converted, what will be the total mass of ethanol and carbon dioxide produced?
(b) if the fermentation is carried out in an open container, would you expert the mass of the container and contents after fermentation to be less than, greater than, or the same as the mass of the container and contents before fermentation?
explain.
(c) if 97.7 g of carbon dioxide is produced, what mass of ethanol is produced

Explanation:

a)C₆H₁₂O₆ = 2C₂H₅OH + 2CO₂

180g               92g            88g

180g glucose gives 88g carbon dioxide and 92g ethanol

200g glucose gives 88/180 x 200 co₂ and 92/180 x 200 g ethanol

ethanol 102.22g , CO₂  97.77g

b) No change in mass after fermentation if we take into account mass of all the product.

c) ethanol produced =102.22g

200

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).