If the concentration of glucose in blood is 0.9g/L, what will be the molarity of glucose in blood?

a) 5M

b) 0.5M

c) 0.005M

d) 50M

Answer: c) 0.005M

Explanation:

Molarity = no. of moles/ Volume in litres

We already know that molar mass of Glucose = 180g/L

Mass of glucose in 1L = 0.9g (from the question)

No. of moles, n = mass / molar mass

n= 0.9 / 180

= 5 x 10-3 mol

Therefore, M = 5 x 10-3 / 1

= 0.005M

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