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Dobrý deň, vedel by mi niekto, prosím, pomôcť s príkladmi z chémie?
1. Máme 2% roztok KOH. Koľko ml musíme zobrať, aby sme získali 0,22g KOH? Predpokladáme, že hustota roztoku je 1g/cm.
2. Koľko gramov 20% roztoku HCl a koľko ml vody potrebujeme na prípravu 200g 5% roztoku?
3. Aké množstvo vody musíme pridať k 30% roztoku NaOH aby sme pripravili 1kg 6% roztoku NaOH?
4. Koľko ml 60% HNO3 s hustotou 1,36 g/cm potrebujeme na prípravu 700ml roztoku s koncentráciu 0,2 mol/dm
Dobrý deň, učím sa francúzštinu, ale jej štúdium mi komplikuje jedna gramatická vec zvaná liaison (viazanie) napríklad v slove: les enfants (lezanfa). Všimol som si, že sa tento jav z FRJ postupne…
Ahojte, vedel by mi prosím niekto vypočítať tento príklad? Akosi mi nesedia desatine čiarky. Ďakujem.
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