PROBLEMS 2.55. Cobalt forms two sulfides: CoS and Co S3. Predict the ratio of th
ID: 717536 • Letter: P
Question
PROBLEMS 2.55. Cobalt forms two sulfides: CoS and Co S3. Predict the ratio of the two masses of sulfur that combine with a fixed mass of cobalt to form CoS and Co2S3. 2.56. Lead forms two oxides: PbO and PbO2. Predict the ratio of the two masses of oxygen that combine with a fixed mass of lead to form PbO and PbO 2. 2.57. When 5.0 g of sulfur is combined with 5.0 g of oxygen, 10.0g of sulfur dioxide is formed. What mass of oxygen would be required to convert 5.0 g of sulfur into sulfur trioxide? "2.58. Nitrogen monoxide (NO) is 46.7% nitrogen by mass. Use th law of multiple proportions to calculate the mass percentage of nitrogen in nitrogen dioxide (NO2).Explanation / Answer
Law of multiple proportions is based on the John Dalton's Law of Atomic Theory. The law states that "'When two elements combine with each other to form two or more compounds, the ratios of the masses of one element that combines with the fixed mass of the other are simple whole numbers"
An answer to 2.55:
In the first compound (CoS) the percent of Cobalt (Co) is 50% and that of Sulfur (S) is also 50%.
The number of parts by mass of Sulfur that combines with one part by mass of Cobalt (Co) is 50/50=1
In the second compound (Co2S3) the percent of Cobalt (Co) is (2/5)*100%=40% and that of Sulfur (S) is also 60%.
The number of parts by mass of Sulfur that combines with one part by mass of Cobalt (Co) is 60/40=1.5
The ratio of the masses of sulfur that combine with a fixed mass of cobalt: 1:1.5
An answer to 2.56:
In the first compound (PbO) the percent of Lead (Pb) is 50% and that of Oxugen (S) is also 50%
The number of parts by mass of Oxygen that combines with one part by mass of Lead (Pb) is 50/50=1
In the second compound (PbO2) the percent of Lead (Pb) is (1/3)*100%=33.33% and that of Oxygen (O) is also 66.67%.
The number of parts by mass of Oxygen that combines with one part by mass of Lead (Pb) is 66.67/33.33=2
The ratio of the masses of oxygen that combine with a fixed mass of lead: 1:2
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