1.

\left. \begin{array} { l l } { \text { at } 4 ^ { \circ } C } \\ { 6.023 \times 10 ^ { 22 } } & { ( b ) } & { 1.338 \times 10 ^ { 22 } } \\ { 6.023 \times 10 ^ { 20 } } & { ( d ) 7.338 \times 10 ^ { 22 } } \end{array} \right.

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