How many moles of sulfate ions are in 200 mL of a 2 M sodium sulfate solution?

0.2 mol

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0.4 mol

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0.6 mol

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0.8 mol

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1.0 mol

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Solution

The correct option is B 0.4 mol

Sodium sulfate molar mass $=$ $142 g / m l$ no. of moles $=$ $m o l a r i t y \times v o l u m e (l)$ $=$ $0.2 \times 2$ $=$ $0.4 m o l$

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