The mass of the quartz crystal shown below is 10 grams, and its volume is 4 cm3. what is the density of quartz?
a. 3.5 g/cm3
b. 2.5 g/cm3
c. 2.0 g/cm3
d. 3.0 g/cm3

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)

What are several ways to reduce the effect of friction

Which is an example of a highly unstable isotope that is often used in fission reactions?