Gas Laws question...need help?

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HoPeItGiVeSyOuHeLl

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A piece of solid carbon dioxide, with a mass of 17.8 g is placed in a 3.2 L (empty) container at 27°C.

a.What is the pressure in the container after all the carbon dioxide sublimes?

b.If 7.8 g of solid carbon dioxide were placed in the same container but it already contained air at 740 torr, what would be the partial pressure of carbon dioxide in the container?

c.What would be the total pressure of the container in part b?
 
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