What are the typical properties of covalent substances ?

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Given the following information: mass of proton = 1.00728 amu mass of neutron = 1.00866 amu mass of electron = 5.486 × 10^-4 amu speed of light = 2.9979 × 10^8 m/s calculate the nuclear binding energy (absolute value) of 3li^6. which has an atomic mass of 6.015126 amu. j/mol.