How many grams of ethanol c2h5oh are required to make a 7.1m solution using 160.0g of water?

Question

Karlie Todd

Chemistry

8 December, 13:06

How many grams of ethanol c2h5oh are required to make a 7.1m solution using 160.0g of water?

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Answers (1)

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Major · Answer 1

Answer is: mass of ethanol is 52,25 grams.

b (solution) = 7,1 m = 7,1 mol/kg.

m (H₂O) = 160,0 g · kg/1000g = 0,160 kg.

n (C₂H₅OH) = b (solution) · m (H₂O).

n (C₂H₅OH) = 7,1 mol/kg · 0,160 kg.

n (C₂H₅OH) = 1,136 mol.

m (C₂H₅OH) = n (C₂H₅OH) · M (C₂H₅OH).

m (C₂H₅OH) = 1,136 mol · 46 g/mol.

m (C₂H₅OH) = 52,25 g.