Caffeine’s molecular formula is C8H10N4O2. the molar mass of caffeine is 194 g/mol. what is the percentage of oxygen in caffeine? a) 8.2%
b) 16.5%
c) 28.9%
d) 49.5%

10. translate each of the following chemical equations into a sentence. a. 2 zns(s) + 3 o2(g) -> 2 zno(s) + 2 so2(g) b. cah2(s) + 2 h2o(l) -> ca(oh)2 (aq) + 2 h2(g)

What term is applied to a scientist who studies ancient life, including animal and plant fossils a. anthropologist b. dendroclimatologist c. geophysicist d. paleontologist

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?