Question

. A sample of an unknown material was analyzed and was found to contain 28.1 g of silicon and 32.0 g of oxygen. What conclusion can best be made about this sample? (A) The sample must be SiO2, because the mole ratio is 1:2. (B) The sample must be Si7O8, because the ratio by mass reduces to 7:8. (C) The sample must be a mixture, because the masses of the elements are different. (D) The sample must be SiO, because the masses of the compounds are close to the same.

Answer 1

(C) The sample must be a mixture, because the masses of the elements are different.