Answer:
The answer to your question is 4.72 x 10²⁵ molecules or 472.87 x 10²³ molecules
Explanation:
Data
number of molecules = ?
number of moles = 78.51 moles of N₂O₅
Process
To solve this problem remember the one mol of any substance equals the Avogadro's number (6.023 x 10²³).
1.- Use proportions and cross multiplication to find the answer.
1 mol of N₂O₅ -------------- 6.023 x 10²³ molecules
78.51 moles of N₂O₅ ----------- x
x = (78.51 x 6.023 x 10 ²³) / 1
x = 4.72 x 10²⁵ molecules or 472.87 x 10²³ molecules
