How much heat would have to be absorbed to raise the temperature of a 500-g iron bar from 25.0°C tp 50.0°

The heat of vaporization for 1.0 mole of a substance X at 45.99°C is 50.6 kJ. Calculate ASsurr for the process X(I) –→ X(g) at 45.99.°C. Report your answer with the correct number of the significant figures. Do not include the unit here but show it in your uploaded work.

Example (2). 1 g of water at 273°K is converted into steam at the same temperature. The volume of water becomes 1671 ml on boiling. Calculate the change in the internal energy of the system if the heat of vaporization is 540 cal/g.

Using the equation y = -5212.3x + 20.672 calculate the heat of vaporization of water (in kJ/mol). x=0.003046, y= 4.82

When 1.720×103 J1.720×103 J of heat energy is added to 36.9 g36.9 g of ethanol, C2H6O,C2H6O, the temperature increases by 19.0 ∘C.19.0 ∘C. Calculate the molar heat capacity of C2H6O. (Answer should be in mol X degrees C)

81.6 g of a metal alloy was heated to 93 o C, then plunged into 105 mL of H 2O that was at 19.5 o C. The system equilibrated at 22.3 oC. What is the specific heat of the metal?

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) 1 atm pressure piston ylinder The temperature of the water bath is monitored, and it is determined from this data that 151. kJ of heat flows into the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the piston does 104. kJ of work on the system during the reaction. water bath gases Is the reaction exothermic or endothermic? O exothermic O endothermic O up Does the temperature of the water bath go up or down? O down O neither O in Does the piston move in or out? O out O neither O absorb Does the reaction absorb or release energy? O release O neither How much energy does the reaction absorb or release? Be sure…

A metal at 121.1 °C and with a mass of 50.3 g is placed in an insulated container with 200.0 g of water at 25.0 °C. The specific heats of each material are: Cmetal = 0.340C = 4.184C Calculate the equilibrium temperature (in °C) of the system. Assume the only energy exchanged is between the metal and the water. Cwater

What is the change in enthalpy when 38.2 g of CH4(g) reacts completly with O2(g) to form CH3OH(g) at constant pressure?