Number of molecules of NaCl in 91 grams of NaCl. Select one: a. 3.3 x 10^18
b. 1.5 x 10^13
c. 9.4 x 10^23
d. 6.022 x 10^23

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

just did the assignment and the answer was #1 +2 n

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