<span>A. It increases the number of collisions between molecules.
I hope this helps :)</span>
You get 42 when you multiply 6 & 7.
Answer: Yea yea please please
Explanation:
No more I don’t have any
Answer:
The density of the substance is 1.0611 
Explanation:
The density of a substance is a characteristic property that matter, whether solids, liquids or gases, has to be compressed in a given space, that is, it allows us to measure the amount of mass in a certain volume of a substance.
Density is expressed as follows:

In this case:
- density: ?
- mass: 21.1164 grams
- volume: 19.9 cm³
Replacing:

density= 1.0611 
<u><em>The density of the substance is 1.0611 </em></u>
<u><em></em></u>
The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

Substituting the values in the formula:



The most common isotope of lead is:
Lead - 207.22 amu
The atomic symbol of lead is
. The atomic number of
is 82.
So, the the most common isotope of lead can be written as:
and Lead - 207.22 amu.