Question

calculate the percentage of oxygen in HgO and CO2

Answer 1

Now, to know the percent composition of Carbon and Oxygen .We will divide their weight with the total weight of CO2. % C = 12.01/44.01 = 0.2729= 27.29% (we will divide 0.2729 with 100 to take the percentage). % O = 32.00/44.01 =0.7271 =72.71 %O in CO2.

Answer 2

Let us consider we begin with one mole of Carbon dioxide molecules. One mole of Carbon Dioxide has one mole of carbon atoms in all and 2 moles of Oxygen atoms as the ratio of Carbon to Oxygen in carbon Dioxide is 1:2.
One mole of Carbon Dioxide has mass 44 g mol−1

One mole of Carbon has mass 12 g mol−1

One mole of Oxygen has mass 16 g mol−1

Two moles of Oxygen has mass 32 g mol−1

mass percentage of Carbon = ( 12 g mol−1x 100 / 44 g mol−1)

mass percentage of Carbon = 1200 / 44 = 27.3%

mass percentage of Oxygen = ( 32 g mol−1x 100 / 44 g mol−1)

mass percentage of Oxygen = 3200 / 44 = 72.7%

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