Question

What is the the concentration of sugar $\left(C_{12}{H}_{22}{O}_{11}\right)$ in mole/L, if $20$ g of it is dissolved in enough water to make a final volume up to $2$ L?

• A. $0.092$
• B. $0.029$
• C. $0.059$
• D. $0.069$

Answer 1

Answer: (B)

$0.029$

Given:

W = 20 gm, GMW = 342, V = 2L=2000mL

The formula for the molarity of sugar is $M=\frac{W}{GMW}\times \frac{1000}{V_{\text{in ml}}}$

Substituting values in the above expression, we get $M=\frac{20}{342}\times \frac{1000}{2000}=0.029M$.