Acompound has an empirical formula of c2h6. what additional piece of evidence is needed to determine the molecular formula?
a. percent composition of carbon
b. mass of the sample
c. relative numbers of atoms of each element
d. molar mass of the compound

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

You have a sample of a metal, the sample is exactly 6.02 x 1023atom, if the sample has a mass 55.85 what metal is your sample made of?