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2.00 g H2 = 1 mole H28.00 g N2 = 8.00g/28 g/mole = 0.285 moles N2
Total moles gas = 1.285 moles
PV = nRT
P = nRT/V = (1.285)(0.08206)(273)/10
P = 2.88 atmospheres
No. of moles = mass/relitive molecular mass in this case = 10/16 = 0.625 so that's 0.625 of a mole and a mole of anything contains 6.022 x 1023 atoms = 3.76 x 1023 atoms in 10g of oxygen.
1000 cm3 = 1dm3 so 10000/1000 = 10dm3