Answer:
1.) 0.619 M
2.) 6.34 L
3.) 12.7 moles
Step-by-step explanation:
Part 1: To find the molarity, you first need to convert grams to moles using the molar mass.
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
143 grams NaCl 1 mole
------------------------- x ------------------------ = 2.45 moles NaCl
58.443 grams
Molarity = moles / volume (L)
Molarity = 2.45 moles / 3.95 L
Molarity = 0.619
Part 2: To find the volume, you need to use the given moles and the previously calculated molarity.
Molarity = moles / volume (L)
0.619 M = 3.93 moles / volume
(0.619 M) x volume = 3.93 moles
volume = 6.34
Part 3: To find the moles, you need to use the given volume and the previously calculated molarity.
Molarity = moles / volume (L)
0.619 M = moles / 20.55 L
12.7 = moles