How many moles of Na2SO4 can I produce if I react 3.12mol of Na with SO4?

What element breaks down into yttrium-90?

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.