According to the analysis carried out in the laboratory, this base has the following molecular composition

According to the analysis carried out in the laboratory, this base has the following molecular composition: w (Be) = 20.9%, w (O) = 74.4%, w (H) = 4.7%. Make up its molecular formula.

Mass ratio of elements in an unknown compound:

w (Be): w (O): w (H) = 20.9: 74.4: 4.7

Taking into account the atomic masses of the elements, let’s move on to the quantitative ratio:

n (Be): n (O): n (H) = w (Be) / M (Be): w (O) / M (O): w (H) / M (H) =

20.9 / 9: 74.4 / 16: 4.7 / 1 = 2.32: 4.65: 4.7 = 1: 2: 2

Thus, in an unknown compound, there are 2 oxygen atoms and 2 hydrogen atoms per 1 beryllium atom, hence the molecular formula of this compound: Be (OH) 2 (beryllium hydroxide).

Answer: Be (OH) 2.