Question

गोल्ड केएक नमूनेमें90% गोल्ड और शेष कॉपर है। गोल्ड केइस नमूनेकेएक ग्राम मेंगोल्ड

केककतनेपरमाणुउपकथित हैं?​

Answer 1

Answer:

As sample is 90% pure wrt to Gold,

So one gram of sample will have 90/100=0.9gm gold.

Number of moles of gold = Mass of gold/Atomic mass of gold

= 0.9/197

=0.0046

According to mole concept,

One mole of gold contains N

A

atoms =6.022×10 ^23

atoms,

∴0.0046 mole of gold will contain =0.0046×6.022×10 ^23

=2.77×10 ^21