An aluminum cube of mass 44.25 g, at 22.3°c, is immersed in a styrofoam cup filled with ln2 at -195.8° c. after 120 seconds (sec), 34.50 g of ln2 evaporates due to heat transferred from the cube. calculate lv of ln2 (in units of calories and grams) and the rate r (calories/second) at which heat from the cube evaporates ln2. (note that the 34.50 g evaporated is due solely to the immersion of the cube, and not by heat transferring into the cup from the room.) use the accepted value of cal (for this temperature range) when calculating lv. use your calculated value of lv when calculating the rate r. show formulas and calculations.

Orange juice has a lower or higher viscosity than chocolate syrup

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

Aflask with vinegar in it has a mass of 160 grams. a balloon with baking soda in it has a mass of 40 grams. the balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. the balloon inflates to a large volume. what will the total mass of the balloon and flask be after the balloon inflates? explain. a) less than 200 grams because the solid baking soda disappears. b) 200 grams, because all the atoms remain in the balloon or flask. c) more than 200 grams because the size of the balloon is so much larger. d) less than 200 grams because gases such as the one in the balloon are lighter than solids and liquids.