Question

For drivers in the UK, the legal limit of the concentration of ethanol (molar mass 46 g mol-1) in the blood mg per 100 cm^3. What is equivalent to a concentration of?

Answer 1

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Answer 2

Answer:

In England and Wales, the blood alcohol limit is

80

⋅

m

g

per 100

m

L

of blood,........

Explanation:

And in Scotland (where there are notable dipsos!) it is

50

⋅

m

g

per 100

m

L

of blood.

And thus is molar terms, we simply turn the mass into a molar quantity:

Molarity

=

Moles of solute

Volume of solution

=

80

⋅

m

g

×

10

−

3

⋅

g

⋅

m

g

−

1

46

⋅

g

⋅

m

o

l

−

1

×

1

100

⋅

m

L

×

10

−

3

⋅

L

⋅

m

L

−

1

=

0.017

⋅

m

o

l

⋅

L

−

1

in England.