Question

Calculate the moles of sodium hydroxide contained in 160 g of it. [Na = 23, O = 16, H = 1]

  • Mole Concept
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Answer

Gram molecular mass of sodium hydroxide

= Na + O + H

= 23 + 16 + 1

= 40 g

40 g of sodium hydroxide = 1 mole

∴ 160 g of sodium hydroxide = 1\over40 × 160

= 4 moles

Hence, number of moles in 160 g of sodium hydroxide is 4

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