What is the density of a 7.68 g plastic cube measuring 2.2 cm on each side? Will this cube float or sink if placed in a glass of water?

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

What is the atomic number of an atom that has 6 protons