A rigid tank that contains 2 kg of N2 at 25°C and 550 kPa is connected to another rigid tank that contains 4 kg of O2 at 25°C and 150 kPa. The valve connecting the two tanks is opened, and the two gases are allowed to mix. If the final mixture temperature is 25°C, determine the volume of each tank and the final mixture pressure.

The volume in the first tank = 0.32

The volume in the second tank = 2.066

The  final pressure of the mixture = 203.64 K pa

Explanation:

First Tank

Mass = 2 kg

Pressure = 550 k pa

Temperature = 25 °c = 298 K

Gas constant for nitrogen = 0.297

From the ideal gas equation

P V = m R T

550 × V = 2 × 0.297 × 298

V = 0.32

This is the volume in the first tank.

Second tank

Mass =  4 kg

Pressure = 150 K pa

Temperature = 25 °c = 298 K

Gas constant for oxygen = 0.26  

From the ideal gas equation

P V = m R T

150 × V = 4 × 0.26 × 298

V = 2.066

This is the volume in the second tank.

This is the iso thermal mixing. i.e.

----- (1)

Put this value in equation (1)

× 2.386 =  550 × 0.32 + 150 × 2.066

= 203.64 K pa

Therefore the  final pressure of the mixture = 203.64 K pa

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.