Element Density at 1000°C & 10 torr: Solve for Molar Mass

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At 1000°C and 10 torr, the density of a gaseous element is given as 2.55×10^-3 g/L. The discussion revolves around using the density equation derived from the ideal gas law to calculate the molar mass of the element. One participant initially struggles with the calculations but ultimately confirms that the correct molar mass is 21 g/mol. The conversation highlights the importance of correctly applying the ideal gas law and density relationships in solving for molar mass. The final answer is established as 21 g/mol.
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Homework Statement


At 1000 deg C and 10 torr, the densit of a certain element in the gaseous state is 2.55×10^-3 g/L. The element is:


Homework Equations





The Attempt at a Solution


So, i took the the density equation, that of which is derived from the ideal gas law, and rearranged to solve for the molar mass, but, unfortunately, it did not suceed. What am I to do to solve this problem?
 
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What molar mass did you get?
 
I got 21 g/mol--which is the answer. Sorry, i was looking at the wrong answer
 
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