The diagram shows the displayed formula of butane-2,3-diol.
a.
[3]
Complete the table to show the number of atoms of each element in this displayed formula.
| Element | Number of atoms |
|---|---|
| C | ........................ |
| H | ........................ |
| O | ........................ |
b.[1]
What is the empirical formula of butane-2,3-diol?
c.[2]
Butane-2,3-diol has a melting point of 19 ∘C19\ ^\circ\text{C}19 ∘C and a boiling point of 177 ∘C177\ ^\circ\text{C}177 ∘C.
What is the state of butane-2,3-diol at 10 ∘C10\ ^\circ\text{C}10 ∘C?
Explain your answer.