Question

Nitu presented a silver lamp to her mother on her birthday. The lamp contained 3. 011 × 10²³ atoms of silver in it. What is the mass of silver lamp and the cost of it if 1 gm silver costs  60. 

Atomic mass of Ag = 108 u, N0 = 6.022 × 10²³ per mole.

Answer 1

Atomic mass of silver (Ag) = 108 u 

Since mass of 6.022 × 10²³ atoms of silver (Ag) = 108 u 

Hence mass of 3.011 × 10²³ atoms of silver (Ag) 

= 108×3.011×10²³/ 6.022×10²³ = 54 gm 

Cost of 1 gm silver = 60 

Therefore, cost of silver lamp = 60 × 54 = 3240