Question

Trisha and her lab partner filled a beaker with 150 milliliters of a 0.10 M HCl solution. How many moles of HCl are in the beaker? Remember, molarity = moles liter .

Answer 1

First convert mL to L 

1L= 1000mL

$150 mL * \frac{1L}{1000mL} = 0.15L$

Next, 
$0.10M = \frac{X moles HCL}{0.15L}$
$0.15*0.10= X moles$
X= 0.015 moles HCL