What mass of water at 23.0°c must be allowed to come to thermal equilibrium with a 1.75-kg cube of aluminum initially at 150°c to lower the temperature of the aluminum to 68.0°c? assume any water turned to steam subsequently recondenses.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2