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mK=39u
mH₂O=18u
2K + 2H₂O ---> 2KOH + H₂
2*39g potasu ------ 2*18g lodu
1000g potasu ------ xg lodu
x = 461,5g lodu
2)
mCa=40u
Ca + 2H₂O ---> Ca(OH)₂ + H₂
40g wapnia ----- 22,4dm³ wodoru
80g wapnia ----- x dm³ wodoru
x = 44,8dm³ wodoru