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13 Dec 2019

A 65.56 g quantity of dry ice (solid carbon dioxide) is allowed to sublime (evaporate) in a position like apparatus. Calculate the expansion work done against external pressure of 0.956 atm and at a constant temperature of 22C. Assume that the initial volume of dry ice id negligible and the CO2 behaves as an ideal gas (1L•atm=101.3J)

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Irving Heathcote
Irving HeathcoteLv2
17 Dec 2019

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Related questions

A 17.5-g quantity of dry ice (solid carbon dioxide) is allowed to sublime (evaporate) in an apparatus like the one shown in the figure below. Calculate the expansion work done against a constant external pressure of 0.975 atm and at a constant temperature of 26°C. Assume that the initial volume of dry ice is negligible and that CO2 behaves like an ideal gas.


I am having trouble with the last two problems of my assignment (numbers 6 & 7). The equation is as follows for magnesite dissolving in HCl:

MgCO3(s) + 2HCl(l) --> Mg2+ + 2Cl- + CO2(g) + H2O(l)

6.) Calculate the volume of CO2 released at standard conditions when 32g of magnesite (MgCO3(s)) is dissolved in HCl. For this I did:

32g / (84.13 g/mol)*(24.7892 L/mol) = 9.41 L

But I am not so sure if this is done correctly.

7.) Continuing from question 6, with the temperature held constant, if the CO2(g) acts as an ideal gas and is allowed to expand reversibly against a pressure of 0.4 bar, what is the work done by the system? This one I am not sure how to go about solving...Any help is appreciated.

I will attach a photo of the document for reference values.

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