Help me Guys please I need help with this My step sister is here and she's a demon and annoying Can I have good ideas what to do

Find the mass in grams of 1.37x1020 particles of h3po4

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.