Have I solved these correctly?

Question

I have two chemistry questions that I have solved and I am not sure if they are correct. I would be really thankful if someone could check if I solved them correctly:

Question 1: What is the volume of carbon dioxide that can be formed through anaerobic fermentation of yeast cells of 10 kg glucose. Molar volume is 25 dm3/moles.

The reaction formula is: C6H12O6 --> 2 C2H5OH + 2 CO2

Answer: Moles of glucose: 10 000 g/ 180 (g/moles) = 500/9 moles.

Moles of carbon is double the moles of glucose so that is 1000/9 moles.

Volume of carbon is is 1000/9 x the molar volume of 25 dm3/moles which equals around 2778 dm3 which I prefer to write as around 2.8 m3.

Answer= 2.8 m3.

Question 2: A balloon with the volume of 250 cubic centimetres is filled with hydrogen gas that has been produced through the following formula: CaH2 + 2 H2O --> 2 H2 + Ca(OH)2. The molar volume is 24 dm3/moles. What is the mass of CaH2 needed for the reaction?

Answer= 250 cm3 = 0.25 dm3 Hydrogen gas. Amount of moles of hydrogen gas is 0.25 dm3 divided with the molar volume of 24 dm3/moles. That will give me 1/96 moles. Amount of moles for CaH2 is half of that according to the reaction formula, namely 1/192 moles.

The mass of the CaH2 is its moles (1/192 moles) multiplied with its molar mass of 42.1 g/moles which gives me around 0.22 g

Answer= 0.22 g

I would really appreciate help!

Answer 1

Maya

Looks correct. Good job.

Mike