hi @jaki01, crap that i saw this now i need to try to solve it.
for a its 40 min, thats correct.
a2,0,833 periode is also right, i get 5,018 * 10^23 molecules
b,die Dichte beträgt 1,24 g /cm3
c,49,04 kJ

i dont know, i was never brilliant in chemistry ..
;D
Kind regards
Jan

new answer
well since C6H12O6 + 6 O2 --> 6CO2 + 6 H2O is correct and 2808,4kJ/mol as well
you only need to see that you are taking a tenth of 0,83 period of mol meaning 0,083 period
this results in 234 kj