What is the pressure, in mmhg, of a 4.00 g sample of o2 gas, which has a temperature of 30.0 °c, and a volume of 3000 ml?

- Pressure of the gas is 790.4 mmHg.

Solution:- Mass of the gas oxygen gas is 4.00 g, temperature is 30.0 degree C and volume is 3000 mL and it asks to calculate the pressure of the gas.

It is based on ideal gas law equation, PV = nRT

Where, P is pressure, V is volume, n is number of moles, R is the universal gas constant and T is temperature.

Let's convert the mass to moles on dividing the grams by molar mass. Molar mass of oxygen is 32 gram per mol.

n =

n = 0.125 moles

Convert degree C to kelvin, for this we add 273.

T = 30.0 + 273 = 303 K

Convert mL to L. For this we divide the given volume by 1000.

V =

V = 3 L

Value of R is 0.0821 atm.L per mol per K.

The equation is rearranged for the pressure as:

Let's plug in the values in the equation to calculate the pressure, P.

P = 1.04 atm

They want answer in mmHg, so let's convert the pressure unit from atm to mmHg.

1 atm = 760 mmHg

so,

= 790.4 mmHg

So, the pressure of the gas is 790.4 mmHg.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.