1.the number 14 is the 'mass number'. what does it tell us about this isotope?

a)how would you calculate the number of neutrons in this isotope?

me on question c (shown in the photo).

In this item, we calculate the moles of nacl with the basis of 1l of solution.
  first, calculate the mass of the solution using the density.
                      m = (1l) x (1000g/1000ml)(1000ml/1l) = 1000g
then, we calculate mass of nacl by multiplying the calculate value with the percentage.
                    m of nacl = (1000 g)(0.0090) = 9 g
then, calculate the moles of nacl by the molar mass.
                    molarity = (9g)(1 mole/ 58.44 g) = 0.1539 mole / l solution or 0.1529m. then, the answer to this item is letter c. 

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