Contrast the magnitudes, to three significant figures, (I) mass of one mole of CO₂, (II) the mass of one mole of NH₃, and then select an appropriate response from the response list.

Question

Quizplus · Accepted Answer

The mass of one mole of a substance is its molar mass, which can be calculated by adding up the atomic masses of each element in the chemical formula. For CO₂: C = 12.01 g/mol O = 16.00 g/mol S = 32.07 g/mol Molar mass = (12.01 g/mol) + (16.00 g/mol) + (32.07 g/mol) = 60.08 g/mol For NH₃: N = 14.01 g/mol H = 1.01 g/mol S = 32.07 g/mol Molar mass = (14.01 g/mol) + (1.01 g/mol) + (32.07 g/mol) = 47.09 g/mol Thus, the molar mass (mass of one mole) of CO₂ is greater than that of NH₃, so the answer is A.

Contrast the Magnitudes, to Three Significant Figures, (I) Mass of One