To identify a diatomic gas (x2), a researcher carried out the following experiment: she weighed
an empty 3.1-l bulb, then filled it with the gas at 1.00 atm and 28.0 °c and weighed it again.
the difference in mass was 3.5 g. identify the gas.

Aluminium

Explanation:

Given data:

Volume = 3.1 L

Pressure = 1.0 atm

Temperature = 28.0 °C (28 + 273.15 = 301.15 K)

Mass = 3.5 g

Identify the gas.

Solution:

First of all we will find the number of moles.

PV = nRT

n = PV/RT

n = 1 atm × 3.1 L / 0.0821 L. atm. K⁻¹.mol⁻¹× 301.15 K

n = 3.1 L. atm / 24.72 L. atm. mol⁻¹

n = 0.13 mol

Now we will find the molar mass.

molar mass = 3.5 g / 0.13 mol

molar mass = 26.9 g/mol

The gas is diatomic so, atomic mass will be half of 26.9 g/mol.

26.9 g/mol / 2 = 13.45 g/mol

The element which has atomic mass closer to the 13.45 is aluminium.

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.

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.