Explain the observed trend in the boiling points of these com- pounds. H;Te -2 °C H,Se -41.5 °C H2S -60.7 °C H,0 100 °C

Calculate the total quantity of heat required to convert 25.0 g of liquid CCI4() from 25.0°C to gaseous CCI, 76.8°C (the normal boiling point for CCI4)? The specific heat of CCI4() is 0.857 J/(g · °C) its heat of fusion is 3.27 kJ/mol and its heat of vaporization is 29.82 kJ/mol. 6.49 kJ 1.64 kJ 5.95 kJ O 1.11 kJ

Calculate the heat released when 25.0 g of steam becomes liquid water at 100.0°C. The molar heat of vaporization of water is 4.07 x 10 4 J/mol.

calculate the total amount of heat needed to convert 22.50 g of solid carbon tetrachloride, CCl4 at a temperature of -35 C to vapor form at 120 C, given the following values for CCl4 : melting point= -22.9 C; boiling point = 76.2C; change in H fusion = 2.69 kj/mol ; change in H vapor =29.8 kj/mol

3. A substance has a heat of vaporization of 28.90 kJ/mol.  At -21 °C it has a vapor pressure of 137 mmHg.  What is the temperature in °C when the vapor pressure is 14 mmHg?  Round to the nearest whole number.

What quanity of energy does it take to convert 0.451 kg ice at -20.0 degrees celcius to steam at 250.0 degrees celcius? Specific heat capacities: Ice, 2.03J/g degrees celcius; liquid, 4.18 J/g degrees celcius; steam, 2.02 J/g degrees celcius. delta H vap = 40.7kJ/mol; deltaHfus = 6.02kJ/mol

Arrange the following in order of decreasing boiling point. Т HIC I H-C-c нн H-C Н Н I-O-I -С H H C-C-NH₂ H H-C-c Н Н Н I-о Н HHF FIC Н HTC H с I C I- -С-Н Н 1 Ч H 15 C-H Н Н Н H H H N С Н D KBr Н Н I-I H Н Н CH3 LICI Н нннннн HTC -Т Н 7 -C от Н IOI CIH с-с-н Н Н

For pentane, the AH° of vaporization is 26.22 kJ/mol and the AS° of vaporization is 87.88 J/ mol K. At 1.00 atm, what is the boiling point of pentane, in K?

The enthalpy of vaporization for acetone is 32.0 kj/mol. the normal boiling point (at 1.00 atm) for acetone is 56.5 C. What is the temperature of acetone at 560 torr?

The normal boiling point of a liquid is 282 degrees Celsius. What is the vapor pressure of this liquid at 162 degrees Celsius? (Hvap= 28.5 kJ/mol)