Question

Calculate the weight in g. of 2.5 moles of ethane [C2H6]. [C = 12, H = 1]

  • Mole Concept
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Answer

Gram molecular mass of C2H6 = (2 × 12) + (6 × 1)

= 24 + 6

= 30 g

1 mole of C2H6 weighs 30 g

∴ 2.5 moles weighs = 30\over 1 × 2.5 = 75 g

Hence, weight of 2.5 moles of ethane [C2H6] is 75 g.

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