Which of the following substances consists of | vedclass

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(A) For $4.25 \ g$ of $NH_3$: Moles of $NH_3 = \frac{4.25 \ g}{17 \ g/mol} = 0.25 \ mol$. Total atoms $= 0.25 \ mol 	imes (1 + 3) \ atoms/molecule =

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$4.25 \ g$ of $NH_3$

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(A) For $4.25 \ g$ of $NH_3$: Moles of $NH_3 = \frac{4.25 \ g}{17 \ g/mol} = 0.25 \ mol$. Total atoms $= 0.25 \ mol 	imes (1 + 3) \ atoms/molecule = 1 \ mol$ of atoms.For $1.8 \ g$ of $H_2O$: Moles of $H_2O = \frac{1.8 \ g}{18 \ g/mol} = 0.1 \ mol$. Total atoms $= 0.1 \ mol 	imes (2 + 1) = 0.3 \ mol$ of atoms.For $2.8 \ g$ of $N_2$: Moles of $N_2 = \frac{2.8 \ g}{28 \ g/mol} = 0.1 \ mol$. Total atoms $= 0.1 \ mol 	imes 2 = 0.2 \ mol$ of atoms.For $4.4 \ g$ of $CO_2$: Moles of $CO_2 = \frac{4.4 \ g}{44 \ g/mol} = 0.1 \ mol$. Total atoms $= 0.1 \ mol 	imes (1 + 2) = 0.3 \ mol$ of atoms.Thus,$4.25 \ g$ of $NH_3$ contains $1 \ mol$ of atoms.

Which of the following substances consists of a total of $1 \ mol$ of atoms? (Molar mass of $NH_3 = 17 \ g/mol, H_2O = 18 \ g/mol, N_2 = 28 \ g/mol, CO_2 = 44 \ g/mol$)

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