A mixture of 8.0 mol Ne and 8.0 mol Xe are at STP in a rigid container. Which of the following statements is TRUE?
A) Both gases have the same average kinetic energy.
B) Both gases contribute equally to the density of the mixture under these conditions.
C) Both gases have the same molecular speed.
D) The mixture has a volume of 22.4 L
E) All of the above are TRUE.
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Ответ:
A) and B)
Explanation:
Let's examine each of the statements in turn.
A) Average kinetic energy
TRUE
A postulate of the Kinetic Molecular Theory is that the molecules of a gas have the same average kinetic energy at the same temperature.
B) Contribution to density
TRUE
There is an equal number of moles, so there are equal numbers of molecules of each gas. The gases will contribute equally to the density.
C) Molecular speeds
FALSE.
The molecules of each gas have the same average kinetic energy.
KE = ½mv²
The less massive neon molecules must move faster to have the same kinetic energy as the xenon molecules.
D) Volume
FALSE
The volume is that of the rigid container. It will be 22.4 L only if that is the volume of the container.
Ответ:
metals are are solids and has high melting point( except mercury and can also conduct heat and electricity, where non-metals may be solids also but,is brittle such as :diamonds etc... Its a bad conductor for heat and has low melting points