A particular gas has a desnity of 11.98 g/dm^3 when the pressure is 138.4 kPa at a temp of 175 degrees F. What is the GMW of this gas? If it is a diatomic gas can you identify the element?
dm^3 = L. so it's 11.98 g/L.
then i converted 139.4 kPa to 1.37 atm.
then i converted 175 to 370 K.
in order to get the molar mass i multiplied the density (11.98 g/L)(0.08206 L * atm/ K* mol)(370K) and divided it by 1.37 atm. I came up with 265.50 g/mole. What am I supposed to do next?
4 answers
I would have rounded the atm to 1.38 but that isn't a big deal. The temperature has not been converted correctly. 175 F converts closer to 350 K but check me out on that (and 350 is not the exact T). After making the correction, recalculate molar mass. Since the gas is diatomic, divide by two and look up the molar mass of the atom on the periodic table. Let us know if you have any trouble.
thank you for your help, it's idodide!
Rethink or reread the periodic table. I am being a little picky here, but the element, which is the question, is IODINE, not iodide. Iodide is the ion formed when an iodine atom gains one electron. Iodine and iodide are two different things. But your math is ok for you to get that number of about 127. Good work.
i apologize that was a typo! thanks for all your help!
1 answer