A 3.000 g sample of a compound containing only carbon, hydrogen and cobalt was analyzed and found to contain 1.453 g of carbon and 0.122 g of hydrogen. If the formula mass (molar mass) of the compound is approximately 372 g/mol, what is its chemical formula?

C₁₅H₁₅Co₃

Explanation:

Compound = Carbon+ Hydrogen + Cobalt

Mass of carbon = 1.453 g

Mass of Hydrogen = 0.122 g

Mass of Cobalt = 3 - 1.453 - 0.122 = 1.425 g

Dividing all through b their molar masses

Carbon = 1.453 / 12 = 0.1211

Hydrogen = 0.122 / 1 = 0.122

Cobalt = 1.425 / 58.9 = 0.02419

Divide all through by the smallest number (0.02419)

Carbon = 0.1211 / 0.02419 = 5

Hydrogen = 0.122 / 0.02419 = 5

Cobalt = 0.02419 / 0.02419 = 1

The empirical formular = C5H5Co

(C5H5Co)n = 372

[(12 * 5 ) + (5 * 1 ) + 58.9]n = 372

n = 372 / 123.9 = 3

Chemical formular;

C₁₅H₁₅Co₃

i think it's letter a.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.