Question

which element has the lowest density at 298 k and 101.3 kpa? (1) argon (3) nitrogen (2) fl uorine (4) oxygen

Answer 1

Nitrogen (N2) has the lowest density at 298 K and 101.3 kPa among the given options due to its lowest molar mass.

Step-by-step explanation:

The element with the lowest density at 298 K and 101.3 kPa among argon (Ar), nitrogen (N2), fluorine (F2), and oxygen (O2) is hydrogen (H2). However, hydrogen is not one of the options provided. Since the question may contain a typo, assuming the correct answer must be chosen from the given elements, we should compare their molar masses to determine the least density, as all gases at the same temperature and pressure will occupy the same volume according to Avogadro's law.

Given molar masses are approximately: Ar = 39.95 g/mol, N2 = 28.01 g/mol, F2 = 38 g/mol, O2 = 32 g/mol. Since density is directly proportional to molar mass for gases at equal temperature and pressure, nitrogen (N2), with the lowest molar mass, will have the lowest density among the options provided.

Answer 2

Among the elements provided, fluorine has the lowest density at 298 K and 101.3 kPa due to its lowest molar mass. So the correct option is 2.

Step-by-step explanation:

The element with the lowest density at 298 K and 101.3 kPa is hydrogen (H₂). Among the options provided, however, fluorine (F₂) would have the lowest density. This is because we are looking at elements in their gaseous state under standard conditions, and the densities of gases are usually compared by looking at their molar masses under the same temperature and pressure. It's important to remember that density is mass per unit of volume, and in conditions where gases display ideal behavior (as they would under these conditions), the density of a gas is directly proportional to its molar mass. Argon (Ar), nitrogen (N₂), fluorine (F₂), and oxygen (O₂) are all elements that exist as gases at room temperature and atmospheric pressure, but fluorine has the lowest molar mass among them, hence the lowest density under these conditions.