O2, Oxygen, has a boiling point of 90K (-183°C), and nitrogen, N2, has a boiling point of 77K (-196° C). Which is a liquid and which is a gas at 80 K (-193°C)?

I find a diagram like this helps with these questions. Do you see the answer?

Not to scale.
101.........H2O gas(steam)
100.........H2O b.p. liq/gas
99..........H2O liquid

20...........room temp H2O liquid
0..........freezing point H2O liq/solid
-1.......... H2O solid

-182............O2 liq? gas?
-183...............b.p. O2 liq/gas
-184..............O2 liq? gas?

-193..............question
-195 N2 gas
-196..............b.p. N2 liq/gas
-197 liq

Nitrogen gas boils at 77K and oxygen boils at -183 Celsius. as liquid air is allowed to warm which gas will escape first?

To determine which substance is a gas and which is a liquid at a given temperature, we compare the boiling points of the substances with the given temperature.

At 80 K (-193°C), the temperature is between the boiling points of oxygen (90 K) and nitrogen (77 K).

Since the boiling point of nitrogen is lower than the given temperature (77K < 80K), nitrogen is a gas at 80 K (-193°C).

On the other hand, since the boiling point of oxygen is higher than the given temperature (90K > 80K), oxygen is a liquid at 80 K (-193°C).

To determine whether oxygen (O2) or nitrogen (N2) is a liquid or a gas at a certain temperature, we need to compare the boiling points of the substances to the given temperature of 80 K (-193°C).

Given:
- Boiling point of oxygen (O2): 90 K (-183°C)
- Boiling point of nitrogen (N2): 77 K (-196°C)
- Temperature given: 80 K (-193°C)

Comparing the boiling points:

- The boiling point of oxygen is higher (90 K or -183°C) than the given temperature of 80 K (-193°C).
- The boiling point of nitrogen is lower (77 K or -196°C) than the given temperature of 80 K (-193°C).

Based on these comparisons, we can determine that at 80 K (-193°C):
- Oxygen (O2) would be a gas because its boiling point is higher than the given temperature.
- Nitrogen (N2) would be a liquid because its boiling point is lower than the given temperature.

Therefore, at 80 K (-193°C), nitrogen (N2) would be a liquid and oxygen (O2) would be a gas.