are my calculations correct?

(0.12/2.54)100=(0.0472)100=472 ( dish + sample )(ish)( sample = meas of evaporaing dsh a100%a+bcgm Part B: Determination of Mass Pereent of Sodium Chloride (NaCl) Mass of (NEW) evaporating dish, watch glass, and NaCl Mass of cvaporator dish, watch glaes Mass of NaCl Pereent of NaCl Please show the calculatians below: (0.54158.5)100=092 Part C: Determination of Mass Percent of Silicen diotide (SiO) Part C: Determination of Mass Pereent of Siticen dioxide (SiO2) Please show the calculations below: (1.95/28+32)100=(0.0325)100=3.25 Part D: Determination of Percent Recovery Mass of original sample (from Part A) 2.SA g Mass determined ( Fe+NaCl+SiO2 recoveted) 26g 102% Please show the calculations below: 2.542.60100=2102.602.58=0.060.12+0.53+1.95=2.60 Discussion: If you did not recover 1007 a sccount for your crrots. What are sorne reasens your because the measured preluct of the reaction conteins impurities that cawses its mass to be greater