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Dobrý deň pomohol by mi niekto prosím s príkladom: v 19,8 ml vody sme rozpustili 200mg alaninu. Koľko percentný roztok alanínu sme získali? Odpoved je 1% vedel by niekto cez vzorec vysvetliť?
Vypočítajte koľko molekúl vodíka vznikne ak do 500g vody dáme 2g Na. 2Na+2H2O-->2NaOH + H2
Mohol by mi niekto pomôcť narysovať trojuholník ABC, ktorý je pravouhlý s pravym uhlom pri vrchole C. A', B', C' sú obrazy bodov A, B, C postupne v stredových súmerností ach so stred i C, A, B …
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