Answer:
three.
Explanation:
Types of Galaxies
Astronomers classify galaxies into three major categories: elliptical, spiral and irregular.
France vs Croatia, Watch Free Live, Online, on today's World Cup Final Match, FIFA 2018, on 15 July, Russia
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https://worldcupfinal.co/francevscroatia
Reduced the number of Communist nations in the world and <span>changed boundaries in Europe. I assume the "affected nations throughout the world" is the second answer that you accidentally added in? </span>
Answer:
53.2%
Explanation:
- Write the mass of the elements in your molecule:
Mass of Si in 1 mol SiO2 =28.1g
Mass of O in 1 mol SiO2 =16x2g= 32g
- Now find the mass of your compound
Mass of compound= 28.1+32=60.1
- Divide each element's mass by the mass of the compound to find the percent by mass following this formula:
% by mass = (mass of element/mass of compound) x 100
% by mass of oxigen= (32g/60.1) x 100
% by mass of oxigen= 53.2%
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