- Use The References To Access Important Values If Needed For This Question A Scientist Measures The Standard Enthalpy Ch 1 (33.18 KiB) Viewed 9 times
Use the References to access important values if needed for this question. A scientist measures the standard enthalpy change for the following reaction to be -348.4 kJ: 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H₂O(1) is kJ/mol. Species NaOH(aq) H₂(g) Na(s) Submit Answer AH (kJ/mol) -470.1 0.0 0.0 Retry Entire Group 6 more group attempts remaining
The specific heat capacity of silver is 0.24 J/°C.g. a. Calculate the energy required to raise the temperature of 159.0 g Ag from 270 K to 291 K. Energy = b. Calculate the energy required to raise the temperature of 1.0 mole of Ag by 1.0°C (called the molar heat capacity of silver). Molar Heat Capacity= J/°C-mol c. It takes 1.26 kJ of energy to heat a sample of pure silver from 12.1°C to 14.5°C. Calculate the mass of the sample of silver. Mass= Submit Answer Try Another Version 9 9 item attempts remaining
Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2755 kJ/mol), and H₂ (-286 kJ/mol), calculate AH for the reaction. C4H4 (9) + 2 H₂ (9) → C4H8 (9) ΔΗ = Submit Answer Try Another Version 10 item attempts remaining
Consider the following reaction: CH4 (9) +20₂(g) → CO₂(g) + 2H₂O(1) A H = -891 kJ a. Calculate the enthalpy change if 6.25 g methane is burned in excess oxygen. Enthalpy change = kJ b. Calculate the enthalpy change if 1.80 x 10³ L methane gas at 730 torr and 25°C is burned in excess oxygen. Enthalpy change = Submit Answer Try Another Version kJ 8 item attempts remaining
The specific heat capacity of silver is 0.24 J/°C.g. a. Calculate the energy required to raise the temperature of 143.0 g Ag from 271 K to 291 K. Energy = b. Calculate the energy required to raise the temperature of 1.0 mole of Ag by 1.0°C (called the molar heat capacity of silver). Molar Heat Capacity= J/°C-mol c. It takes 1.36 kJ of energy to heat a sample of pure silver from 12.1°C to 14.5°C. Calculate the mass of the sample of silver. Mass= Submit Answer Try Another Version 9 8 item attempts remaining
A 31.6-g sample of water at 290. K is mixed with 50.8 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. Temperature = Submit Answer K Try Another Version 8 item attempts remaining
A 149.0-g sample of a metal at 75.4°C is added to 149.0 g H₂O at 14.8°C. The temperature of the water rises to 18.5°C. Calculate the specific heat capacity of the metal, assuming that all the heat lost by the metal is gained by the water. The specific heat capacity of water is 4.18 J/°C.g. Specific heat capacity= J/°C-g Submit Answer Try Another Version 9 item attempts remaining