
The largest number of molecules is in:
(a) 36g of water
(b) 28g of carbon monoxide
(c) 46g of ethyl alcohol
(d) 54g of nitrogen pentoxide
Answer
469.5k+ views
Hint: We can use the formula to calculate the number of moles by taking Avogadro’s number, molecular weight of the compound and its given weight.
Complete answer:
The formula to calculate the number of moles of a given substance is as follows.
Avogadro’s Number =
We have to calculate the number of molecules in the given options
Number of molecules in 36g of water
Chemical formula of water =
Molecular weight of water = 18g
Given weight of water = 36g
Number of moles =
Number of molecules in 28g of carbon monoxide
Chemical formula of carbon monoxide =
Molecular weight of carbon monoxide = 28g
Given weight of carbon monoxide = 28g
Number of moles =
Number of molecules in 46g of ethyl alcohol
Chemical formula of ethyl alcohol =
Molecular weight of ethyl alcohol = 46g
Given weight of ethyl alcohol =46g
Number of moles =
Number of molecules in 54g of nitrogen pentoxide
Chemical formula of nitrogen pentoxide =
Molecular weight of nitrogen pentoxide = 108g
Given weight of nitrogen pentoxide = 54g
Number of moles =
- From the above calculations we can say that 36 g of water contains the highest number of molecules when compared to remaining molecules given in the options.
Therefore, the correct answer is option (a).
Note:
We should know the molecular weight of the chemicals to calculate the number of moles from it. The molecular weight of the compound = sum of the molecular weights of each element involved in the chemical composition.
Complete answer:
The formula to calculate the number of moles of a given substance is as follows.
Avogadro’s Number =
We have to calculate the number of molecules in the given options
Number of molecules in 36g of water
Chemical formula of water =
Molecular weight of water = 18g
Given weight of water = 36g
Number of moles =
Number of molecules in 28g of carbon monoxide
Chemical formula of carbon monoxide =
Molecular weight of carbon monoxide = 28g
Given weight of carbon monoxide = 28g
Number of moles =
Number of molecules in 46g of ethyl alcohol
Chemical formula of ethyl alcohol =
Molecular weight of ethyl alcohol = 46g
Given weight of ethyl alcohol =46g
Number of moles =
Number of molecules in 54g of nitrogen pentoxide
Chemical formula of nitrogen pentoxide =
Molecular weight of nitrogen pentoxide = 108g
Given weight of nitrogen pentoxide = 54g
Number of moles =
- From the above calculations we can say that 36 g of water contains the highest number of molecules when compared to remaining molecules given in the options.
Therefore, the correct answer is option (a).
Note:
We should know the molecular weight of the chemicals to calculate the number of moles from it. The molecular weight of the compound = sum of the molecular weights of each element involved in the chemical composition.
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