What is the mass of 1.7 × 1023 atoms of zinc (zn)? a. 0.0143 b. 0.054 c. 19 d. 230 i really need with this problem. i did the math and got 18.4, and i can't round it. would it be c?

Number of moles is defined as the ratio of given mass in g to the molar mass.

The mathematical formula is:

Number of moles =   (1)

Number of zinc atoms is equal to , by Avogadro number, number of moles can be calculated.

As, 1 mol= atoms, hence,

= 0.2822 mol

Now, from formula (1), calculate mass in g (molar mass of zinc = 65.4 g/mol)

0.2822 mol =

mass in g  =

= 18.45588 g

Thus, by rounding off the above number, it will come near about 19 g approximately.

Hence, option (C) is the correct answer.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.