Why are plastic cups good heat insulators

0.09 moles of sodium sulfate in 12 ml of solution

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth