1.

4.0 grams of caustic soda contains

A.  \[\text{6}.0\text{2 }\times \text{l}{{0}^{\text{23}}}\text{ atoms of H}\]
B.  4 g atoms of Na
C.  \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\text{ atoms of Na}\]  
D.  \[\text{4 moles of NaOH}\]
Answer» D.  \[\text{4 moles of NaOH}\]


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