An unknown compound contains only carbon, hydrogen, and oxygen (C2H,02). Combustion of 4.00 g of this compound produced 5.87 g of carbon dioxide and 2.40 g of water.
How many moles of hydrogen, H, were in the original sample?

a:

by the combination of an unlimited number of elements

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.