04 (a) 1 (b) 2 14. Total number of ...
Question

# 04 (a) 1 (b) 2 14. Total number of moles of oxygen atoms in 3 litre 0.() at 27°C and 8.21 atm are: (d) none of these (a) 3 (b) 1 1 (C) 15. 3.011x 1022 atoms of an element weighs 1.15 gm. The atomic mass of the element is: (d) 23 amu (a) 10 amu (b) 2.3 amu (c) 35.5 amu

JEE/Engineering Exams
Chemistry
Solution
169
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Molar gas volume at ( mathrm{STP}=22.4 ) litres We need to convert this volume to the volume the gas would occupy at STP ( mathrm{p} 1=8.21 mathrm{atm} ) [ mathrm{p} 2=1 mathrm{atm} ] ( mathrm{v} 1=3 ) litres ( quad mathrm{v} 2=? ) ( mathrm{t} 1=27+273=300 mathrm{k} quad mathrm{t} 2=273 mathrm{K} ) ( p uparrow vee 1 / t 1=p 2 v 2 / t 2 ) ( (8.21 times 3) / 300=(1 times v 2) / 273 ) From which ( mathrm{v} 2=22.4133 ) litres Number of moles of ( 03=22.4133 / 22.4=1 ) mole Each O3 molecule has 3 atoms of ( mathrm{O} ) Number of moles of oxygen atoms ( =3 times 1 )
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