Find the volume and number of molecules of 180g oxygen.

M (O2) = 2 * 16 = 32 g / mol

n (O2) = m / M = 180/32 = 5.6 mol

V (O2) = 5.6 * 22.4 = 126 l.

N (O2) = n * Na = 5.6 * 6.022 * 10 ^ 23 = 33.72 * 10 ^ 23



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