Question

un om foloseşte in 24 h 720 l de O2. Calculeaza masa lui O2 in c.n.

Answer 1

n = nr. de moli = masa / M.moleculara (M.molec. O2 = 32 g/mol)

tot n = V / Vm (Vm = volumul molar = 22,4 L in c.n.)

=> V / Vm = m / M.molec

=> m = V × M.molec. / Vm = 720 × 32 / 22,4 = 1028,57 g O2