1. ir a mixture contains 0.639 g nacl, 0.350 g nhaci, & 0.851 g of sio2, with due regar
signiricant figures, what is the mass percent of nacl in the mixture?

34.73%

We are given;

A mixture that contains;

We are required to determine mass percent of NaCl in the mixture;

Mass of the mixture = Mass of NaCl + Mass of NH₄Cl + Mass of SiO₂

                                 = 0.639 g + 0.350 g + 0.851 g

                                 = 1.84 g

The mass % of NaCl = (Mass of NaCl ÷ Mass of the mixture) 100

                                  = (0.639 g ÷ 1.84 g) × 100

                                  = 34.73%

Therefore, the mass % of NaCl in the mixture is 34.73%

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.