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Mole Concept and Avogadro's Number

Calculate the...

Question

Calculate the number of molecules in 85 g of $H_{2} S$ .

2 N_{A}

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2.5 N_{A}

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3 N_{A}

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4.5 N_{A}

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Solution

The correct option is A $2.5 N_{A}$
Number of moles = 85/34 = 2.5 moles
Number of molecules = moles * Avogadro number = $2.5 N_{A}$

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