How many moles are in 20.50 grams of nh3?
a. 3.4 x 10 -24 moles
b. 1.23 x 1026 moles
c. 1.204 moles
d. 349.12 moles

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils