2. How many grams of sodium fluoride (NaF) are needed to prepare a 0.400m NaF
solution that contains 750 g water? (molar mass of NaF - 42.0 g/mol)
20%
A 18.9 g NaF
OB 9.12 g NaF
c 12.6 g Naf
OD 28.0 g Naf

12.6 g NaF

Explanation:

Recall that 1g of water =1 ml of water hence the volume of the solution is 750ml

Given that

m/M= CV

m= mass of solute =

M= molar mass of solute= 42.0 g/mol

C= concentration of solution= 0.400 M

V=volume of solution= 750ml

m= MCV

m= 42.0g/mol × 0.400 M ×750/1000

m= 12.6 g of NaF

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

the correct answer would be d. hope this !