Multiple Choice Question Answer XX — task. Science CBSE, Class 9.

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1. The largest number of molecules is in

46 g of ethyl alcohol
38 g of CO
36 g of water
54 g of nitrogen pentoxide

2. Calculate the number of atoms present in 1 g He gas.

\(3.0115\) × \(10^2{^3}\)
\(6.023\) × \(10^2{^3}\)
\(1.506\) × \(10^2{^3}\)
\(12.046\) × \(10^2{^3}\)

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