If there is 8g of a substance before a physical change, how much will there be afterwards

What is i fracture in the crust called when land move up, down or sideways

If it is an isoelectronic series select true, if not select false. o2-, s2-, se2-, te2- na+, k+, rb+, cs+ n3-, p3-, as3-, sb3- ag, cd+, sn3+, sb4+ f-, cl-, br-, i- f-, ne, na+, mg2+ s2-, s, s6+

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?