Astronomers used to think that the universe was made up of <span>baryonic matter.
Now, astronomers say its made up of atoms, dark matter, and mostly dark energy. hope that helps!</span>
Answer:
CO
Explanation:
the rest are elements. CO is made up of one carbon atom and one oxygen atom
Answer:
the movement of particle of air filled inside the balloon changes as a result of change in temperature ...So, the density also the volume of gas is increased/decrease...
Explanation:
Hope This help
When the enthalpy change of the reaction is positive, the reaction is exothermic.
Answer:
The average atomic mass is 86.565
Explanation:
An element's average atomic mass is the sum of the products of the masses of the isotopes of the element and their percentage abundance divided by 100
The average atomic mass of the Element X is given as follows;
Isotope type 1 (85.91) ×
Isotope Abundance (%) Mass /100 Portion of average mass
Type 1 67.25 × 85.91 ÷ 100 57.774475
Type 2 32.75 × 87.91 ÷ 100 28.790525
Average atomic mass = 86.565
The average atomic mass = 86.565.