Which of the following is the heaviest?

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Question

(C) Calculate the mass of each substance:$1$. $25 \ g$ of mercury = $25 \ g$.$2$. $2 \ moles$ of water $(H_2O)$: Molar mass = $(2 	imes 1) + 16 = 18

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$2 \ moles$ of carbon dioxide

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(C) Calculate the mass of each substance:$1$. $25 \ g$ of mercury = $25 \ g$.$2$. $2 \ moles$ of water $(H_2O)$: Molar mass = $(2 	imes 1) + 16 = 18 \ g/mol$. Mass = $2 	imes 18 = 36 \ g$.$3$. $2 \ moles$ of carbon dioxide $(CO_2)$: Molar mass = $12 + (2 	imes 16) = 44 \ g/mol$. Mass = $2 	imes 44 = 88 \ g$.$4$. $4 \ g$ atoms of oxygen $(O)$: Mass = $4 	imes 16 = 64 \ g$.Comparing the masses: $88 \ g > 64 \ g > 36 \ g > 25 \ g$.Therefore,$2 \ moles$ of carbon dioxide is the heaviest. The correct option is $C$.

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