Which sample contains the largest number of molecules?

Question

Quizplus · Accepted Answer

The number of molecules in a sample can be determined by dividing the mass of the sample by the molar mass of the compound and then multiplying by Avogadro's number. The compound with the smallest molar mass will have the largest number of molecules for the same mass of compound. The molar mass of each compound is as follows:- COS (Carbon Monoxide): C (12.01) + O (16.00) = 28.01 g/mol- CH4 (Methane): C (12.01) + 4H (4*1.01) = 16.05 g/mol- CBr4 (Carbon Tetrabromide): C (12.01) + 4Br (4*79.904) = 331.63 g/mol- CHBr3 (Bromoform): C (12.01) + H (1.01) + 3Br (3*79.904) = 252.73 g/molMethane (CH4) has the smallest molar mass, meaning for 100 g of each compound, methane will have the largest number of molecules.

Which Sample Contains the Largest Number of Molecules