Question

1. what volume of 2.50 m naoh (40.00 g/mol) contains 0.100 mole of naoh?

a. 0.250 l
b. 40.0 ml
c. 25.0 ml
d. 0.250 ml
e. 0.0400 ml

1. what volume of 12.0 m hcl solution needs to be diluted to produce 500.0 ml of 3. m hcl solution?

a. 0.125 l
b. 0.250 l
c. 0.500 l
d. 2.00 l
e. 1.00 l

Explanation:

Step1: Use molarity formula

Molarity \( M=\frac{n}{V}\), so \( V = \frac{n}{M}\). Given \( n = 0.100\space mol\) and \( M=2.50\space M\).

Step2: Calculate volume

\(V=\frac{0.100\space mol}{2.50\space mol/L}=0.0400\space L\). Convert to mL: \(0.0400\space L\times1000\space mL/L = 40.0\space mL\).

Answer:

B. \(40.0\space mL\)