chemistry question need help?!?

Question

The mass of a sample of a nickel (average atomic mass 58.69 amu) is 11.74g how many atoms does it contain?

Thanks

Answer 1

You need to find the weight of one mole. I do not know the molar weight of nickel but its should be available.

One mole of a substance is the weight of 6.02 x 10^23 atoms.

For example : if some random substance had the molar weight of 2 grams that means that 6.02 x 10^23 atoms of that substance weighs 2 grams.

Answer 2

n = m/M
n = 11.74/58.69
n =.2000 mole
using avagadros number 1 mole contains 6.023*10^23

0.2000*6.023*10^23
=1.205*10^23 atoms