Answer:
477 moles of KNO₃
Step-by-step explanation:
From the question above.
If 1 mole of anything = 6.02×10²³ molecules,
Thenn, X mole of KNO₃ will be 2.87×10²⁶ molecules of KNO₃
i.e,
1 mole of KNO₃ ⇒ 6.02×10²³ molecules of KNO₃
X mole of KNO₃ ⇒ 2.87×10²⁶ molecules of KNO₃
Solving for X
X = (1 mole of KNO₃× 2.87×10²⁶ molecules of KNO₃)/6.02×10²³ molecules of KNO₃
X = 476.7 moles of KNO₃. ≈ 477 moles of KNO₃
Hence the right Option is 477.