Question

Find the mass

(1) 0.5 mole of oxygen gas

(2) 3.011×10^23 atoms of oxygen

(3) 6.022×10^24 molecules of oxygen

Answer 1

1 mole of O2 =32g. 0.5mole=16g.6.022 .10*23=16g(not oxygen gas). 3.011.10*23=8g.6.022.10*23=32g hence 6.022.18*23 molecules =320g.