H2SO4= 200*7.3/100=14.6
H2SO4+CU(OH) 2=CUSO4+2H2O
X= 14.6*159/98=23.68
Cr(NO3)3 + 3NaOH = 3NaNO3 + Cr(OH)3
N2 + 3H2 = 2NH3