Question

If the concentration of glucose ($C_6{H}_{12}{O}_6$) in blood is 0.9 g $L-1$, what will be the molarity of glucose in blood?

• A. 5 M
• B. 50 M
• C. 0.005 M
• D. 0.5 M

Answer 1

Answer: (C)

0.005 M

Molar mass of glucose $C_6{H}_{12}{O}_6=$180 g/mol

concentration of gluocose = 0.9 g/L

mass of glucose in 1 L =0.9 g

Molarity,$M=\frac{\text{no. of moles}}{\text{volume in L}}$

no. of moles,n=mass/molar mass

$n=\frac{0.9}{180}=5\times {10}^{-3}$ mol

$M=\frac{5\times {10}^{-3}}{1}=0.005M$

Hence, the correct option is $C$