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!

I'm pretty sure there's a geometry rule for   anyways, if the triangle is equilateral, and the circle is circumscribed, the circle is outside of the triangle.  to find the area, you need the radius.  the radius should be a straight line from the center of the triangle to any of it's points.  draw lines from the center of the circle to each of the triangle points.  draw three more lines from the center to the middle of the sides of the triangle.  you should now have six separate 30-60-90 triangles inside of your original triangle. use your 30-60-90 rules to solve for the radius, then the circumference. 

How is this a question? where are the answer choices?