Question

Calculate the mass of lithium fluoride (LiF) in 496 mL of a 0.8 M solution.

Answer 1

10.29 g LiF

Step-by-step explanation:

First things first we need to remember that M=mol/L, so we have to convert 496 mL to L

469 mL* (1L/1000mL)= 0.496L

Using this value and the molarity equation, we can find moles of LiF

0.8M= mol LiF/ .496L

Mole LiF= .397 moles

To get mass, we need to convert these moles using the molar mass of LiF, which is 25.94 g/mol. We multiply so that the unit of moles cancels out and we are left with grams.

.397 moles * 25.94 g/mol= 10.29 g LiF