Challenge: balance the equations below A. ___ NaNO3 + ___ PbO → ___ Pb(NO3)2 + ___ Na2O
B. ___ Ca3P2 + ___ H2O → ___Ca(OH)2 + ___ PH3
C. ___Fe2O3 + ___ CO → ___Fe + ___ CO2
D. ___NH3 + ___ O2 → ___ NO2 + ___ H2O
E. ___FeS + ___O2 → ___Fe2O3 + ___SO2
F. ___ C3H8 + ___ O2 → ___ CO2 + ___ H2O

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

i think its 5049.

i hope this !

ok whats the question if not i cannot you i need question and need a thing to answer