0.6078 moles of sodium chloride are in 74 gm of the mixture.
Mixture of sand and Nacl = 74gm
48% by mass is Nacl
48% = mass of Nacl / Total mass of mixture
48% = mass of Nacl / 74gm
Mass of Nacl = 48% of 74gm
Mass of Nacl = 48/100*74gm
Mass of Nacl = 35.52gm
Actual mass of Nacl = 58.44 gm
SO, the molar mass of Nacl = 35.52 / 58.44
= 0.6078 moles
The molar mass of the chemical compound is defined as the mass of the sample of that compound divided by the amount of substance which is the number of moles in that sample.
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