(FESP) O volume de álcool etílico que devemos misturar com 80cm3 de água destilada para obtermos uma solução alcoólica de densidade 0,93 g/cm3 é (despreze a contração de volume que acompanha a mistura de álcool com água): (Dados: d H2O = 1 g/cm3 ; dC2H2OH = 0,79 g/cm3) a) 4cm3 . B) 40cm3 . C) 60cm3 . d) 70cm3 . E) 65 cm3

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

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?

A1.5l container holds p.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50.c what is the molar mass of the unknown gas