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2 answers:
Answer: Option (b) is the correct answer.
Explanation:
Freezing point is defined as the point at which liquid state of a substance changes into solid state.
So, in the given table it is shown that at temperature the substance is changing into solid state. Whereas at
the substance is in liquid state.
Hence, will be the freezing point of the substance.
Thus, we can conclude that the statement its freezing point is , is correct about the unknown substance.
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Answer:
The density of the ideal gas is directly proportional to its molar mass.
Explanation:
Density is a scalar quantity that is denoted by the symbol ρ (rho). It is defined as the ratio of the mass (m) of the given sample and the total volume (V) of the sample.
......equation (1)
According to the ideal gas law for ideal gas:
......equation (2)
Here, V is the volume of gas, P is the pressure of gas, T is the absolute temperature, R is Gas constant and n is the number of moles of gas
As we know,
The number of moles:
where m is the given mass of gas and M is the molar mass of the gas
So equation (2) can be written as:
⇒
⇒ ......equation (3)
Now from equation (1) and (3), we get
⇒ Density of an ideal gas:
⇒ <em>Density of an ideal gas: ρ ∝ molar mass of gas: M</em>
<u>Therefore, the density of the ideal gas is directly proportional to its molar mass. </u>