A sample of krypton gas in a container of volume 1.90 L exerts a pressure of 0.553 atm at 21 Celsius. How many moles of gas are present?

A sample of 0.0435 mol of krypton in a 1.90 L container exerts a pressure of 0.553 atm at 21 °C.

We have a sample of krypton gas in a 1.90-L (V) container that exerts a pressure (P) of 0.553 atm at 21 °C (T). We can calculate the moles (n) of krypton using the ideal gas law.

It is an equation of state of an ideal gas that relates pressure, volume, moles of gas, and temperature. The mathematical expression is:

P × V = n × R × T

where R is the ideal gas constant (0.0821 atm.L/mol.K)

To apply this law, first, we must convert 21 °C to Kelvin using the following expression.

K = °C + 273.15 = 21°C + 273.15 = 294 K

The moles of krypton are:

P × V = n × R × T

n = P × V/R × T

n = 0.553 atm × 1.90 L/(0.0821 atm.L/mol.K) × 294 K = 0.0435 mol

A sample of 0.0435 mol of krypton in a 1.90 L container exerts a pressure of 0.553 atm at 21 °C.

Learn more about the ideal gas law here: link

0.044 mole

Explanation:

Data obtained from the question include:

V (volume) = 1.90 L

P (pressure) = 0.553 atm

T (temperature) = 21°C = 21 + 273 = 294K

R (gas constant) = 0.082atm.L/Kmol

n (number of mole of krypton) =?

Using the ideal gas equation PV = nRT, the number of mole of krypton can obtained as illustrated below:

PV = nRT

n = PV /RT

n = (0.553 x 1.9)/(0.082x294)

n = 0.044 mole

Therefore, 0.044 mole of krypton is present in the container.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.