Given the following thermochemical data at 25°C and 1 atm pressure, 02(8) + 2B(3) -- B2O3(); AHP =-1264 kJ
03(g) + 2B(s) BLO3(); AH° = -1406 kJ
determine AH” for the following reaction at 25°C and 1 atm pressure.
302(g) → 203(g)
-980 kJ/mol
+284 kJ/mol
+980 kJ/mol
-2670 kJ/mol
-284 kJ/mol

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration?

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base