The denser a substance, the more tightly packed it is. the table below shows the volume and mass of two different substances:

which of the two substances is more tightly packed?
object r is more tightly packed.
object s is more tightly packed.
both objects are packed equally tightly.
this cannot be determined.

i need mutiple choices

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

the maximum mass of nh3 is nh3 in grams