This question is about elements in Group 7 of the periodic table.
Table 1 shows the melting points and boiling points of fluorine, chlorine, and bromine.
| Element | Melting point in °C | Boiling point in °C |
|---|---|---|
| Fluorine | -220 | -188 |
| Chlorine | -101 | -35 |
| Bromine | -7 | 59 |
Using Table 1, determine the state of fluorine at -200 °C.
Balance the equation for the reaction between iron and chlorine: 2Fe+‾Cl2→2FeCl32\text{Fe} + \underline{\quad}\text{Cl}_2 \rightarrow 2\text{FeCl}_32Fe+Cl2→2FeCl3
Calculate the relative formula mass (MrM_rMr) of iron(III) chloride, FeCl3\text{FeCl}_3FeCl3. Relative atomic masses (ArA_rAr): Fe=56\text{Fe} = 56Fe=56, Cl=35.5\text{Cl} = 35.5Cl=35.5.