Ccl2f2 is considered to be environmentally safe and is used as a refrigerant. the heat of vaporization of ccl2f2 is 289 j/g. what mass of this substance must evaporate in order to freeze 2 moles of water initially at 20°c? the heat of fusion of water is 334 j/g and the specific heat of water is 4.18 j/g-k.

Geologists get to play with chemistry, physics, and history! and what a history you will meet as youwork your way through the course. starting at the beginning, the textbook provides the scientifically acceptedstart of the and promises that you'll get to explore some of the evidence for that scientific view, later inthe semester. meanwhile, which is more nearly correct of the scientifically accepted view? a) the earth formed when the big bang caused older materials to fall together, about 14 billion years ago.b) the earth formed from the falling together of older materials, about 4.6 billion years ago.c) the earth formed in the big bang, about 6000 years ago.d) the earth is eternal, having been here forever and promising to be here forever.e) the earth was assembled by gigantic space beavers, which gnawed down the primordial tree of life andpiled its branches together to form the planet.