The answer is actually C. endorphins. during regular exercise, the pituitary gland and central nervous system produce endorphins
Chemical name of NH4Cl is
=》Ammonium chloride.
Chemical name of Na2CO3 is
=》Sodium carbonate
Molar mass(Pb(NO3)4) =
= 207.2 × 1 + 14 × 4 + 16 × 12 =
= 455.2 g/mol
n(Pb(NO3)4) = 594 g ÷ 455.2 g/mol ~
~ 1.3 mol