Question

What is the mass of 1.7 × 1023 atoms of zinc (Zn)?

Answer 1

Please Explain! i dont understand

Answer 2

you need to do a conversion. From the periodic table you can get the molar mass of Zn, which is the number of grams of zinc in one mole of zinc (6.022x10^23 atoms)
from that you can find what fraction of a mole of atoms 1.7 x 10^23 is, and use that fraction to determine the weight of the sample.

Answer 3

molar mass of Zinc is 65.4

Answer 4

#atoms x (mass/mole of atoms)
a mole is Avagadro's number, 6.022 x 10^23, so
#atoms x (mass/6.022 x 10^23 atoms)=mass

Answer 5

what fraction of a mole is 1.7 x 10^23 ?

Answer 6

where do I get the number of atoms from ?

Answer 7

you are given that you have 1.7 x 10^23 atoms of Zn in the problem

Answer 8

1.7x10^23 x (65.4/6.022x10^23) = mass?

Answer 9

right :) notice how the units cancel

Answer 10

18.46 !

Answer 11

\[1.7\times10^{23}\cancel{\text{atoms}}\times\left(\frac{65.4\text{grams}}{6.022\times10^{23}\cancel{\text{atoms}}}\right)\approx18.46\text{grams}\]it is important to keep track of the units.

Answer 12

good job :)

Answer 13

wow . thank you very much !

Answer 14

welcome :)

Answer 15

This diagram can be really helpful for these kinda problem :)

Answer 16

Thanks !