Answer to Question #227390 in Chemistry for emir

Question

mass (g) of 4.04x10^20 molecules of dinitrogen pentoxide

Answer 1

1 mol contains 6.022×10²³ elementary entities of the substance.

4.04x10²⁰ molecules of dinitrogen pentoxide = 4.04x10²⁰ / 6.022×10²³ = 0.0007 mol.

n = m / M

M (N₂O₅) = 108 g/mol

m (N₂O₅) = n x M = 0.0007 x 108 = 0.07 g