Answer:
610. mL Na₃N
Explanation:
To find the volume of the sodium nitride (Na₃N), you need to
(1) convert grams to moles (using the molar mass)
(2) calculate the volume in liters (using the molarity ratio)
(3) convert liters to milliliters (1,000 mL = 1 L)
It is important to arrange the conversions in a way that allows for the cancellation of units.
(Step 1)
Atomic Mass (Na): 22.990 g/mol
Atomic Mass (N): 14.007 g/mol
Molar Mass (Na₃N): 3(22.990 g/mol) + 14.007 g/mol = 82.977 g/mol
107.3 g Na₃N 1 mole
------------------------ x ------------------- = 1.29 moles Na₃N
82.977 g
(Step 2)
Molarity (M) = moles / volume (L)
2.12 M = 1.29 moles / ? L
(2.12 M)(? L) = 1.29 moles
? L = 0.610
(Step 3)
1,000 mL = 1 L
0.610 L Na₃N 1,000 mL
------------------------ x -------------------- = 610. mL Na₃N
1 L
