The number of hydrogen atoms in 0.25 moles of h2 s o4
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in 1mole of h2so4=98g
RAtio of h=2/98
IN 0.25 moles of h2so4=25/100*98=49/2g
mAss of h in it=2/98*49/2=1/2g
No of atoms of h=1/4*2/98*6.022*10^24=3.011/98*10^24atoms
hope it helps
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