Calculate the mass in gram, in g of
a. 1×10^23molecules of methane
b . 2.5 moles of cl2

Find the mass in grams of 1.37x1020 particles of h3po4

Drug abuse will not lead to physical and psychological dependence. true or false ?

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?