What is the weight percent of each o in sio^2?

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%

I hope you find this information useful and interesting! Good luck!

It's probably because the earth is actually tilted and is not straight when orbiting the sun. that's why when it's winter here, it's summer in the southern hemisphere. in the wintertime in the northern hemisphere, it's colder here because it's tilted away from the sun and the southern hemisphere is tilted closer to the sun (i believe this is the case anyways)