Question

please solve this on paper wiyh the steps thank u

Q.1) A mole of X reacts at a constant pressure of 43.0 atm via the reaction: X(g) + 4Y(g) + 2/(g) AH° = -75.0 kJ Before the reaction, the volume of the gaseous mixture was 5.00 L. After the reaction, the volume was 2.00 L. Calculate the value of the total energy change, AE, in kilojoule. Show your work, express your answer to three significant figures, and include the appropriate units. Q.2) A volume of 115.0 mL of HO is initially at room temperature (22.00 °C). A chilled steel rod at 2.00 °C is placed in the water. If the final temperature of the system is 21.00 °C, what is the mass of the steel bar? Assume density of water is 1.00 g/mL. specific heat of water = 4.18 J/(g°C) specific heat of steel = 0.452 J/(g:°C) Show your work, express your answer to three significant figures, and include the appropriate units. Q.3) Given that the pk of pyridine is 8.75. CHN + H2O = CHÍNH + OH a) What is the pH of a 0.120 M solution of pyridine? Show your work and express your answer to two decimal places.

Answer 1

1. We know AHI AE+PAV op - 75 =4E - 43x3x1013 ToOo or -75 =AE - 13.0677 Or 4 E =(-75 +13.0677) KJ AH = -75.0 KJ P = 43.0 atm AV =Ve-Vi =(2.00-5.00) -3.0L DAVE -- 43x3 Lati P. 43X3X10/• 3 ve Looo : =61.9323 KJ (Anis)