Which MOST closely defines population density?
2 answers:
Answer: Option (A) is the correct answer.
Explanation:
Usually, density is defined as mass present in per unit volume.
Mathematically, Density =
Since density is directly proportional to mass so, more is the mass of an object more will be its density.
Similarly, population in terms of density is the number of organisms of a species per unit area.
Thus, we can conclude that out of the given options the number of organisms of a species per unit area MOST closely defines population density.
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Answer : The molecular weight of a gas is, 128.9 g/mole
Explanation : Given,
Density of a gas = 5.75 g/L
First we have to calculate the moles of gas.
At STP,
As, 22.4 liter volume of gas present in 1 mole of gas
So, 1 liter volume of gas present in mole of gas
Now we have to calculate the molecular weight of a gas.
Formula used :
Now put all the given values in this formula, we get the molecular weight of a gas.
Therefore, the molecular weight of a gas is, 128.9 g/mole