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x kg tlenu - spala - 12 kg węgla
x = 8*12/3 = 96/3 = 32
x = 32.
Odp. Potrzeba 32 kg ;)
8 --------------- x
3x = 12*8
3x = 96 |:3
x = 32 [kg]
3g C -------------- 8g O2
12kg C -------------- x kg O2
x = 32 kg