Polyatomic Ionic Compounds

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

What is the percent by mass of magnesium sulfate in mgso4.7h2o

Type the letter that represents the correct location for each particle type below. the neutron is found at __ the electron is found at __ the proton is found at __