Question

an average chocolate chip cooking contains 55.0 mg of salt (NaCl) how many molecules of salt are normally found in an average chocolate chip cookie?

Question 10 (3 points) An average chocolate chip cooking contains 55.0 mg of salt (NaCl). How many molecules of salt are normally found in an average chocolate chin cookie?!

Answer 1

one chip contains 55.0mg of NaCl

So

mass of NaCl in one chip = 55.0mg = 55x10-3  g

We know one mole of any compound contains Avogadro number of particles

thus

1 mole of NaCl [1molx 58.5g/mol] contains 6.022x 1023 molecules

55x10-3  g of NaCl contains = 55x10-3  g x 6.022x 1023 molecules / 58.5 g

=5.66x1020 molecules of NaCl

So the molecules of NaCl in an average chip is 5.66x1020 molecules of NaCl