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Dobrý deň, vedel by mi prosím niekto pomôcť s týmto chemickým príkladom ? Ďakujem
Najprv sa zmiešalo 75g 12,5% roztoku KNO3 a 20,5g 8% KNO3. Vypočítajte hmotnosť 2,75% roztoku KNO3, ktorý treba pridať do takto pripraveného roztoku, aby sa pripravil výsledný roztok, v ktorom hmotnostný zlomok KNO3 je rovný 0,05.
Prvej družici Zeme Sputnik bola udelená rýchlosť 7,4 km.s-1 a družica obletela Zem za 1hod. 43 min. Aká bola jej stredná výška nad povrchom Zeme?
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