Question 1
How much heat is released when 105 g of steam at 100.0 °C is cooled to ice at -15.0 °C? The enthalpy of vaporization of water is 40.67 kJ mol
-1, the enthalpy of fusion for water is 6.01 kJ mol
-1, the molar heat capacity of liquid water is 75.4 J mol
-1 °C
-1, and the molar heat capacity of ice is 36.4 J mol
-1 °C
-1.
◦ 347 kJ
◦ 54.8 kJ
◦ 319 kJ
◦ 273 kJ
Question 2
What is the edge length of a face-centred cubic unit cell made up of atoms having a radius of 128 pm?
◦ 1020 pm
◦ 512 pm
◦ 181 pm
◦ 362 pm