A 31.00 mL sample of an H2SO4 solution of unknown concentration is titrated with a 0.1372 M KOH solution. A volume of 41.22 mL of KOH was required to reach the equivalence point. What is the concentration of the unknown H2SO4 solution?

The most efficient way to establish the best possible economizer position is to measure

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?