Question

You have a freshly prepared 1 M (molar) solution of glucose in water. You carefully pour out a 100 mL sample of that solution. How many glucose molecules are included in that 100 mL sample?

Answer 1

Answer:

$6.022\times 10^{22}$glucose molecules are included in that 100 mL sample.

Explanation:

Concentration of freshly prepared glucose solution = 1 M = 1 mol/L

1 L = 1000 ml

This means that 1 mole of glucose is present in 1000 mL of water.

If we have 100 mL of solution. then number of moles of glucose will be L;

$\frac{1}{1000}\times 100 mL=0.1 mole$

1 mole =  $N_A=6.022\times 10^{23}$ molecules/atoms

Number of molecules of glucose in 0.1 mole :

= $0.1 mol\times 6.022\times 10^{23} molecules=6.022\times 10^{22} moleules$