Answer:
m = 72.6 grams
Explanation:
Given that,
The density of the substance uis 1.2 g/mL
Volume, V = 60.5 mL
We need to find the mass of the substance. Density is equal to mass divided by its volume. So, it can be given by :

So, the mass of the substance is 72.6 grams.
Answer : The correct option is, 11.77 L
Solution : Given,
Mass of bromine gas = 84 g
Molar mass of bromine gas = 159.8 g/mole
First we have to calculate the moles of bromine gas.

Now we have to calculate the volume of bromine gas at STP.
As we know that at STP,
1 mole of bromine gas contains 22.4 L volume of bromine gas
So, 0.5256 mole of bromine gas contains
volume of bromine gas
Therefore, the volume of bromine gas at STP is, 11.77 L
Answer:
It occurs when a gas passes through a tiny hole.
Explanation:
Effusion is a term used to describe when a gaseous molecule in a container passes or escapes through a tiny/small hole. Effusion and diffusion are two properties of gases that are often used interchangeably, however, they differ.
Effusion differs from diffusion in the sense that the gas passes through a TINY HOLE that is smaller than the normal path. This is contrary to when gas disperses throughout a container as in diffusion.