Question

which of the following has same number of molecules as present in 144 gram of magnesium

Answer 1

the answer is 72 g of carbon

Answer 2

Heya user
Here is your answer !!

We know that 1 mole of any element contains 6.022 * 10^23 atoms.

Now , molar mass of magnesium is 24 g .
24 g of Mg contains 1 mole of Mg atoms .
So , 144 g of Mg contains = 144 / 24 moles = 6 moles .

Now , lets take Carbon .

Molar mass of carbon is 12 g .
12 g of C contains 1 mole of C atoms .
Hence , 6 mole of C atoms will be contained in 12 * 6 g = 72 g .

So , option ( 3 ) is correct .

hope it helps !!