Isotopes are atoms of the same element that have the same number of protons with different numbers of neutrons, hence they have different masses.
the natural abundance of these elements vary, we are given percentages in which these isotopes exist.
average atomic mass is the weighted average atomic mass of an atom relative to 1/12th the mass of a C-12 atom. the average atomic mass can be calculated by taking the sum of the masses of isotopes multiplied by the respective abundance percentage
average atomic mass = (235.044 amu x 80%) + (<span>238.051 amu x 20%)
= 188.04 + 47.61
= 235.65 amu
the average atomic mass is 235.65 amu </span>
Answer: The Answer is minus 221kj.
Explanation: Solved in the attached picture.
Answer:
3 is oxygen and ozone and 4 is only methane.
Explanation:
Note, a compound consists of 2 or more elements.
Total density of filled ball with hydrogen gas:
The relationship between mass and volume can be easily determined using density; for example, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). The ball filled with hydrogen will float in the air because total density of filled ball is lessor than the density of an air.
Density of hydrogen gas =
Mass of the hydrogen gas :
Learn more about Mass and Density here:
brainly.com/question/10821730
#SPJ4