Calculate the change in entropy that occurs in the system when 3.90 mole of diethyl ether (C4H6O) condenses from a gas to a liquid at its normal boiling point (34.6∘C). ΔHvap = 26.5 kJ/mol. Answer in J/K

Calculate the change in entropy that occurs in the system when 3.90 mole of diethyl ether...
Calculate the change in entropy that occurs
in the system when 1.04 mol of diethyl ether (C4H10O) condenses
from a gas to a liquid at its normal boiling point (34.6 ∘C). The
heat of vaporization is 26.5 kJ/mol.
Calculate the change in entropy that occurs in the system when 1.76 mol of diethyl ether (C4H10O) condenses from a gas to a liquid at its normal boiling point (34.6 ∘C). The heat of vaporization is 26.5 kJ/mol.
Calculate the change in entropy that occurs in the system when 1.46 mol of acetone (C3H6O) condenses from a gas to a liquid at its normal boiling point (56.1 ∘C). The heat of vaporization is 29.1 kJ/mol.
Calculate the change in entropy that occurs in the system when 1.16 mol of acetone (C3H6O) condenses from a gas to a liquid at its normal boiling point (56.1 .C) The heat of vaporization is 29.1 kJ/mol Express your answer with the appropriate units.
Calculate the change in entropy that occurs in the system when 1.80 mol of acetone (C3H6O) condenses from a gas to a liquid at its normal boiling point (56.1 ∘C). The heat of vaporization is 29.1 kJ/mol. Express your answer with the appropriate units.
What is the energy change (in kJ) when 0.487 kilograms of diethyl ether (C4H10O) is condensed from a gas at 34.6°C (its boiling point) to a liquid at the same temperature? The ΔHvaporization for diethyl ether = 26.0 kJ/mol.
Calculate the change in entropy that occurs in the system when 4.10 mole of isopropyl alcohol (C3H8O) melts at its melting point (-89.5∘C). ΔH∘fus = 5.37 kJ/mol express answer using 3 sig figs
This question asks: Calculate the change in entropy that occurs in the system when 1.00 mol of methanol (CH3OH) vaporizes from a liquid to a gas at its boiling point (64.6 degrees Celcius). For methanol, enthalpy of vaporization = 35.21 kJ/mol I'm getting the correct answer (104) but I'm getting a negative for some reason, and the book says it's positive, but the formula changeinEntropy = -enthalpy of system/T, so why isn't this number negative?
Diethyl ether has a molar heat of vaporization of 26.5 kJ/mol and a normal boiling point of 34.6 °C. What is the vapor pressure of diethyl ether at 10.0 °C?
Calculate the change in entropy that occurs in the system when 49.0 g of acetone (C3H6O) freezes at its melting point (-94.8∘C). ΔH∘fus = 5.69 kJ/mol. Answer in J/K