Question

To prepare 300.0 ml of 0.2 M NaCl how many grams of NaCl should be weighed out

Answer 1

molar mass NaCl = 58.44 g/mol

Volume = 300.0 mL / 1000 => 0.3 L

number of moles:

1 L ------------- 0.2 M
0.3 L ---------- moles ?

moles = 0.3 x 0.2 / 1 => 0.06 moles of NaCl

Mass of NaCl:

1 mole NaCl -------------- 58.44 g
0.06 moles NaCl --------- mass

mass = 0.06 x 58.44 => 3.5064 g of NaCl