Question

What are the states of substances x, y and z at room temperature?

Answer 1

X is a solid, y is a gas, and z is a gas. If the boiling point is higher than 25°C (room temp) then it is a gas, and if the melting point is lower than 25°C, it is a solid. If room temperature is inbetween the melting and boiling point, it is a liquid.

Answer 2

X: solid (25 is less than 150 so it hasn't melted yet)
Y: gas (25 is greater than -84 so it already evaporated)
Z: gas (25 is greater than 16 so it already evaporated)