Question

From 200 mg of CO2 when x molecules are removed 2.89× 10-3 moles ofbCO2 are left X will be

Answer 1

We have 200 mg of carbon dioxide. The molar mass of carbon dioxide is 44g. That is there are 6.022 × 1023 molecule of CO2 in 44g of CO2. Thus

number of moles of CO2 in 44g of CO2 = 1

number of moles of CO2 in 1g of CO2 = 1 / 44

number of moles of CO2 in 200 mg or 200 × 10-3 g of CO2 = (1 × 200 × 10-3) / 44

= 4.545 × 10-3 moles

We are given that after removing X molecules from 200 mg of CO2, 2.89 X 10-3 moles of CO2are left. Therefore, number of moles of CO2removed will be 

= total number of moles of CO2 - number of moles of CO2 left

= 4.545 × 10-3 - 2.89 × 10-3

= 1.655 × 10-3 moles of CO2

Thus, 1.655 × 10-3 moles of CO2 were removed. The number of molecules X can be calculated by simply multiplying this quantity with Avogadro's number. So, number of CO2molecules removed will be 

= 1.655 X 10-3 X 6.022 X 1023

= 9.969X 10-20 molecules of CO2

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Answer 2

Answer:

We have 200 mg of carbon dioxide. The molar mass of carbon dioxide is 44g. That is there are 6.022 × 1023 molecule of CO2 in 44g of CO2. Thus

number of moles of CO2 in 44g of CO2 = 1

number of moles of CO2 in 1g of CO2 = 1 / 44

number of moles of CO2 in 200 mg or 200 × 10-3 g of CO2 = (1 × 200 × 10-3) / 44

= 4.545 × 10-3 moles

We are given that after removing X molecules from 200 mg of CO2, 2.89 X 10-3 moles of CO2are left. Therefore, number of moles of CO2removed will be 

= total number of moles of CO2 - number of moles of CO2 left

= 4.545 × 10-3 - 2.89 × 10-3

= 1.655 × 10-3 moles of CO2

Thus, 1.655 × 10-3 moles of CO2 were removed. The number of molecules X can be calculated by simply multiplying this quantity with Avogadro's number. So, number of CO2molecules removed will be 

= 1.655 X 10-3 X 6.022 X 1023

= 9.969X 10-20 molecules of CO2