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O2 8 g= 8/32=0,25mol
mol O2/V O2 = molH2/V H2
mol H2 = 0,25/2,5.15= 1,5 mol
mol zat X = 1/2.1,5=0,75 mol ==> Ar X = 0,36/0,75=48
2) 2 KClO3 ---> 2 KCl + 3 O2
0,7 g N2 = 0,7/28= 0,025 mol
mol N2/ V N2 = mol O2/ V O2
mol O2 = 0,025/0,5. 0,6=0,03 mol
KClO3 = 2/3.0,03= 0,02 mol
masa KClO3 = 0,02.122,5= 2,45 g
3) 2 S + 3 O2 ---> SO3
8 g S= 8/32= 0,25mol
SO3 = 1/2.0,25= 0,125 mol
mol N2 / vol N2 = mol SO3/V SO3
V SO3 = 0,625 L