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DrBob222P

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It depends to a large extent upon what devices you use to measure (crude wooden meter stick or something with a vernier scale) versus the kind of balance used to measure the loss in weight).
Convert 26.4 g F2 to moles. moles = gfams/mola mass. Then use PV = nRT. Don't forget to use T in Kelvin. Standard P is 1 atm and standard T is 273 K. Solve for V ( in liters).
moles Ni = 5.2 x 10^15/6.022 x 10^23 = ?? moles Ni = g/atomic mass. You have moles Ni from above and you can look up the atomic mass NI from the periodic table. That leaves just one unknown, grams.
Look up that equation, nEF = -lnK (I'm not at home and can't confirm that equation so check it out) but that is the one you want to use.
Probably close to that of water. 4.184 J/g*K or 1 cal/g/*K

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