Answer:
9.76 x 10²³molecules
Explanation:
Given parameters:
Mass of N₂O₅ = 175gram
Unknown:
Number of molecules = ?
Solution:
To find the number of molecules contained in the given mass, we need to find the number of moles of N₂O₅ first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of N₂O₅ = 2(14) + 5(16) = 108g/mol
Number of moles = [tex]\frac{175}{108}[/tex] = 1.62moles
Now;
1 mole of a substance = 6.02 x 10²³ molecules
1.62 mole of N₂O₅ = 1.62 x 6.02 x 10²³ = 9.76 x 10²³molecules
