Zadanie 3
Wzorowane na: Chemistry SL Paper 1, May 2024, TZ2, pytanie 3. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Polecenie
Ethane-1,2-diol has the molecular formula C2H6O2. Which statement about its empirical formula is correct?
A. It is CH3O, because it shows the simplest whole-number ratio of the atoms of each element
B. It is C2H6O2, because it shows the actual number of atoms of each element in one molecule
C. It is CH3O, because it shows the simplest ratio of the masses of the elements
D. It is C2H6O2, because it is the simplest formula that can be written for the compound
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
A ✔
«the atoms are present in the ratio C : H : O = 2 : 6 : 2 = 1 : 3 : 1, so the empirical formula is CH3O; C2H6O2 is the molecular formula; the ratio of masses would be 24.02 : 6.06 : 32.00, not 1 : 3 : 1»
Schemat punktowania
One mark for the correct option.