A certain mass of carbon reacts with 128 g of oxygen to form carbon monoxide.________ grams of oxygen would react with that same mass of carbon to form carbon dioxide,according to the law of multiple proportions.
A)25.6
B)64.0
C)128
D)1280
E)256

Question

Quizplus · Accepted Answer

According to the law of multiple proportions, the ratio of the masses of oxygen that combine with a fixed mass of carbon in carbon monoxide (CO) and carbon dioxide (CO2) should be a simple whole number ratio. Since CO has one oxygen atom and CO2 has two, the mass of oxygen in CO2 should be double that in CO. Therefore, 128 g of oxygen in CO would require 256 g of oxygen in CO2.

A Certain Mass of Carbon Reacts with 128 G of Oxygen