F. additional problems solve the following problems in the space provided. show your work. 30. the gaseous product of a reaction is collected in a 25.0-l container at 27°c. the pressure in the container is 216 kpa, and the gas has a mass of 96.0 g. what is the molar mass of the gas? 31. the separation of uranium-235 from uranium -238 has been carried out using gaseous diffusion. calculate the relative rates of diffusion of gaseous uf6 containing these isotopes. molar mass of uf6 containing uranium-235 = 349.0 amu. molar mass of uf6 containing uranium-238 = 352.0 amu.

Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size