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# Which of the following weighs the least?

1 g of $C{O}_{2}$

2 litres of $C{O}_{2}$ at N.T.P.

$3.01×{10}^{11}$ molecules of $C{O}_{2}$

$3.01×{10}^{22}$ atoms of carbon

Please do not use chat terms. Example: avoid using "grt" instead of "great".