You have 3 (h2(so4)) on the reactants side so you need to have 6 total hydrogen’s on the products side. Therefore 3(h2) is required.
You can't really describe it but this is what it looks like http://www.chemspider.com/Chemical-Structure.453291.html
The answer would be 560,848,164 because the 0 at the start WOULDNT matter
Shallow ones are seismic waves from deep quakes that have to travel farther to the surface, losing energy along the way. shaking is more intense from quakes that hit close to the surface.
