the mass number of fluorine (F) is 19
C. 19
CFCs and their associated compounds were developed in the early 1900s as a non-toxic, non-flammable solution to other more dangerous products such as ammonia.
Answer:
Morphology and phylogenetics revealed by fossils. Perhaps the strongest evidence to support the Cambrian evolutionary explosion of animal forms is the first clear appearance, in the Early Cambrian, of skeletal fossils representing members of many marine bilaterian animal phyla
Explanation:
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<span>6mole of H2O contains 18×6 g=108 g</span>
Answer:
Work done=50J
Heat removed=29J
Now
Hence the internal energy would decrease by 21J
