Answer:
0.816
Step-by-step explanation:
1 mole of NaCN is
Na = 23
C = 12
N = 14
Total = 49 grams / mole (just add 23 + 12 + 14)
moles when only 10 grams of NaCN are used.
moles = grams/molar mass
grams = 10
molar mass = 49
moles = 10 / 49
moles = 0.204 moles
Volume in Liters
250 mL = 250mL/1000 mL / Liter = 0.25 Liters
Molarity
M = m/V
M = 0.204/0.25 = 0.816