A gas mixture is made by combining 5.5 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 13.59 L. What is the molar mass of the unknown gas?

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?