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JEE Main levelOne or more correct optionsDifficulty 2 of 3mc128

Which of the following contain the same number of atoms as 4 g of helium ( $He = 4$ , monatomic)? Use 22.4 L/mol at STP.

A11.2 L of $N X_{2}$ at STP
B22.4 L of Ne gas at STP
C16 g of $O X_{2}$
D9 g of $H X_{2} O$

Answer: A, B, C

4 g He = 1 mol atoms. 16 g

O X_{2}

= 0.5 mol x 2 = 1 mol atoms (true). 22.4 L Ne = 1 mol atoms (true). 9 g water = 0.5 mol x 3 = 1.5 mol atoms (false). 11.2 L

N X_{2}

= 0.5 mol x 2 = 1 mol atoms (true).

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